Open Access

Abdominal bloating is the most bothersome symptom in irritable bowel syndrome with constipation (IBS-C): a large population-based Internet survey in Japan

  • Motoyori Kanazawa1Email author,
  • Hiroto Miwa2,
  • Ayako Nakagawa3,
  • Masanori Kosako3,
  • Hiraku Akiho3 and
  • Shin Fukudo1
BioPsychoSocial MedicineThe official journal of the Japanese Society of Psychosomatic Medicine201610:19

https://doi.org/10.1186/s13030-016-0070-8

Received: 4 April 2016

Accepted: 16 May 2016

Published: 4 June 2016

Abstract

Background

Abdominal bloating is a common symptom in patients with irritable bowel syndrome with constipation (IBS-C). However, it is not included among the required items in the Rome III diagnostic criteria for IBS. Little is known about an impact of abdominal bloating seen in patients with IBS-C. Using a large population-based sample, the aim of the present study was to investigate what is the most bothersome symptom in subjects with IBS-C.

Methods

An Internet survey of 30,000 adults drawn from the general public throughout Japan was conducted to identify subtypes of IBS using the Rome III diagnostic questionnaire. Consecutively, the screened subjects with IBS-C and the same number of age- and sex-matched non-IBS subjects who were randomly selected as controls were asked to answer a questionnaire on the degree of anxiety they experienced in their daily lives, thoughts about bowel habit, and their dominant gastrointestinal symptoms together with exacerbation factors (for IBS-C only).

Results

The screening survey showed that the prevalence of overall IBS was 16.5 % (female 17.4 %, male 15.5 %) and that 2.8 % met the criteria for IBS-C, 4.5 % for IBS with diarrhea (IBS-D) and 8.2 % for mixed IBS (IBS-M). Seven hundred and fifty-nine of 835 (90.9 %) subjects with IBS-C and 746 of 830 (89.9 %) control subjects completed the consecutive questionnaire. IBS-C subjects felt a higher degree of anxiety in their daily lives (p < 0.01) and considered bowel habit to be an indicator of health (p < 0.01) to a greater extent than control subjects. In IBS-C, the degree of anxiety was significantly associated with abdominal discomfort (p < 0.01), pain (p < 0.01) and bloating (p = 0.02), but not with the frequency of bowel habit (p > 0.1). Abdominal bloating was the most bothersome symptom (27.5 %), which was more likely to occur after a meal (52.2 %), at work/school (29.2 %) and during times of stress (26.8 %). Only 4.5 % of IBS-C subjects reported abdominal pain as the ‘most bothersome’ symptom.

Conclusions

A large population-based Internet survey suggests that abdominal bloating has a great impact on the daily lives of subjects diagnosed with IBS-C. Not only bowel movement/abdominal pain but also abdominal bloating should be evaluated in patients with IBS-C.

Keywords

Irritable bowel syndrome (IBS) Constipation Abdominal bloating Stress Food Epidemiology

Background

Irritable bowel syndrome (IBS) is a common functional gastrointestinal (GI) disorder that affects between 10 and 20 % of the population worldwide [1]. Based on the Rome III diagnostic criteria for functional GI disorders, IBS is defined as recurrent abdominal pain or discomfort (at least 3 days per month in the last 3 months) associated with at least two of the following: improvement with defecation, onset associated with a change in stool frequency, and/or onset associated with change in stool form [2]. The diagnosis of IBS is subtyped by the predominant stool pattern: constipation (IBS-C), diarrhea (IBS-D), mixed (IBS-M), or unspecified (IBS-U) [2].

Approximately two-thirds of subjects with IBS relate their symptoms to their intake of food [3, 4]. Most of IBS patients modify their diet, and these modifications sometimes result in an inadequate diet [3] which may be associated with bowel symptoms. Patients with IBS also feel more stress compared to healthy subjects in their daily life [5, 6]. IBS symptoms often exaggerate when patients feel stress and/or anxiety [7]. Moreover, it has been reported that menstruation was associated with a worsening of abdominal pain and bloating and with more increase in rectal pain sensitivity compared with most other phases of the menstrual cycle in patients with IBS [8].

Abdominal bloating is commonly reported by patients with IBS [9]. However, it is not included among the required items in the Rome III diagnostic criteria [2]. Patients with IBS-C show more abdominal bloating and/or distention than those with IBS-D [10]. Constipation is often associated with delayed gastrointestinal transit [11]. The severity of abdominal bloating correlated strongly with the degree of abdominal distention only in IBS-C [12], suggesting that the pathophysiology is likely to be different between subtypes of bowel habit.

In general population, we have found that even non-consulters with IBS showed more impaired quality of life (QOL) compared to non-IBS subjects as well as patients with IBS [6, 13]. It has been reported that IBS symptom severity was associated with lower QOL [14, 15]. However, little is known about an impact of IBS symptoms including abdominal bloating seen in patients with IBS-C. Using a large population-based sample, the aim of the present study was to investigate what is the most bothersome symptom in subjects with IBS-C.

Methods

As a preliminary survey, an Internet survey of 30,000 adults drawn from the general public throughout Japan (that is, from 47 prefectures in Japan) was conducted to identify subtypes of IBS. Participants were required to meet the following criteria to be eligible for the survey: (1) no conflicts of interest with advertising, marketing research, health care, or pharmaceutical/chemical companies; (2) 20-79 years of age; and (3) subjects who understand Japanese and were living in Japan. They were randomly selected using an online survey system (Automatic Internet Research System: AIRs, Macromill, Inc., Japan). Same numbers of males and females from the different five aged groups (20s, 30s, 40s, 50s and 60–79 years; 3000 subjects each) registered with the Macromill monitor panel (Macromill, Inc., Japan) were recruited during October 28–31, 2013 (Table 1).
Table 1

Demographics of study subjects (Preliminary study)

 

Participants (n = 30,000), n (%)

Gender and age range (years)

 

 20-29 in females

3000 (10)

 20-29 in males

3000 (10)

 30-39 in females

3000 (10)

 30-39 in males

3000 (10)

 40-49 in females

3000 (10)

 40-49 in males

3000 (10)

 50-59 in females

3000 (10)

 50-59 in males

3000 (10)

 60-79 in females

3000 (10)

 60-79 in males

3000 (10)

Marital status

 

 Married

17,391 (58)

 Not married

12,609 (42)

Annual household income (yen)

 

  < 2 million

2557 (8.5)

 2-4 million

6818 (22.7)

 4-6 million

6564 (21.9)

 6-8 million

3940 (13.1)

 8-10 million

2321 (7.7)

 10-12 million

1089 (3.6)

 12-15 million

691 (2.3)

 15-20 million

300 (1.0)

20 million

146 (0.5)

 unknown

2795 (9.3)

 not answered

2779 (9.3)

Diagnosis of IBS

 

 non-IBS

25,058 (83.5)

 IBS (overall)

4942 (16.5)

  IBS with constipation (IBS-C)

835 (2.8)

  IBS with diarrhea (IBS-D)

1359 (4.5)

  Mixed IBS (IBS-M)

2452 (8.2)

  Unspecified IBS (IBS-U)

296 (1.0)

The IBS module on the Japanese version of the Rome III diagnostic questionnaire of which the validity and reliability have already been confirmed [16, 17] was used to identify IBS and subtypes of bowel habit (Additional file 1: Figure S1). IBS-C was defined when a patient reported hard or lumpy stools ≥25 % of the time, and loose or watery stools <25 % of the time, IBS-D was defined when a patient reported loose or watery stools ≥25 % of the time, and hard or lumpy stools <25 % of the time, IBS-M was defined when the patient reported loose or watery stools ≥25 % of the time, and hard or lumpy stools ≥25 % of the time, and IBS-U was defined when the patient could not be subtyped according to these criteria, but met all other diagnostic criteria for IBS [2]. Additionally, frequency of abdominal bloating/distention in the last 3 months was also asked. The online system guided participants to complete the questionnaire without remaining missing item answers.

Consequently, of the 30,000 participants, the screened subjects diagnosed as IBS-C and the same number of age- and sex-matched non-IBS subjects who were randomly selected as controls were invited to a main survey during November 1–4, 2013.

In the main survey, IBS-C subjects and controls were asked to answer a questionnaire which consists of 7 items on the degree of anxiety they experienced in their daily lives, number of bowel movement in a week and thoughts about bowel habit, and 6 items on their dominant GI symptoms (from the first to the third place) together with exacerbation factors such as situations and time periods in their daily lives (for IBS-C only, Additional file 2: Figure S2).

We conducted an anonymous Internet survey but regarded the online response as obtained informed consent for the present study. The disclosure of this study was approved by the Ethics Committee of Tohoku University School of Medicine (approval number: 2015-1-405).

The Mann–Whitney U-test or χ 2 test was used for comparisons between two groups. The Kendall’s τ-b was used to evaluate associations between the symptoms and exacerbation factors among IBS-C. The level of statistical significance was set at a P-value of less than 0.05.

Results

The preliminary survey

The demographics of 30,000 participants were shown in Table 1. Mean age with standard deviation (SD) of the participants was 45 ± 14 years. The screening survey showed that the prevalence of overall IBS was 16.5 % (female 17.4 %, male 15.5 %) and that 2.8 % met the criteria for IBS-C, 4.5 % for IBS-D, 8.2 % for IBS-M, and 1.0 % for IBS-U. Subjects with IBS (n = 4942) were more likely to be female (53.0 vs. 49.4 %, p < 0.01) and were younger (42 ± 14 vs. 45 ± 15 years, p < 0.01) compared to non-IBS subjects (n = 25,058). IBS-C subjects alone (n = 835) were much more likely to be female (72.2 vs. 49.4 %, p < 0.01) but were older (47 ± 14 vs. 45 ± 15 years, p < 0.01) compared to non-IBS subjects. There was no significant difference in annual household income between IBS and non-IBS subjects. Subjects with IBS (overall, 70.0 %; IBS-C, 84.2 %; IBS-D, 53.3 %; IBS-M, 76.6 %; IBS-U, 51.7 %) were more likely to report abdominal bloating for at least two to three days a month compared to non-IBS subjects (19.5 %, p < 0.01, respectively).

The main survey

Seven hundred and fifty-nine of 835 (90.9 %, 541 females) subjects with IBS-C and 746 of 830 (89.9 %, 537 females) age- and sex-matched subjects with non-IBS (controls) completed the consecutive questionnaire. IBS-C subjects felt a higher degree of anxiety in their daily lives (p < 0.01) and considered bowel habit to be an indicator of health (p < 0.01) to a greater extent than control subjects (Table 2).
Table 2

Comparisons of beliefs about bowel habit between IBS-C and controls (Main study)

 

Controls (n = 746), n (%)

IBS-C (n = 759), n (%)

p-value

Female/male number

537/209 (72.0/28.0)

541/218 (71.3/28.7)

n.s.

Age (mean ± SD, years)

47 ± 14

47 ± 14

n.s.

Frequency of bowel habit (median, times/week)

7

3

<0.01

Ideal frequency of bowel habit

  

<0.01

 6 times/week or less

113 (15.1)

165 (21.7)

 

 7 times/week

581 (77.9)

563 (74.2)

 

 8 times/week or more

52 (7.0)

31 (4.1)

 

Considered bowel habit to be an indicator of health

  

<0.01

 None

291 (39.0)

71 (9.4)

 

 Sometimes

206 (27.6)

221 (29.1)

 

 Often

90 (12.1)

186 (24.5)

 

 Mostly

69 (9.2)

148 (19.5)

 

 Always

90 (12.1)

133 (17.5)

 

Degree of anxiety in daily life

  

<0.01

 None

403 (54.0)

176 (23.2)

 

 Sometimes

283 (37.9)

440 (58.0)

 

 Often

46 (6.2)

111 (14.6)

 

 Almost

14 (1.9)

32 (4.2)

 
The most common symptom associated with constipation in subjects with IBS-C was abdominal bloating (80.1 %) and was followed by excessive gas (71.3 %) and abdominal discomfort (64.3 %), whereas 29.1 % of IBS-C subjects reported abdominal pain during constipation (Table 3). The degree of anxiety was significantly associated with abdominal discomfort (Kendall’s τ = 0.09, p < 0.01), pain (τ = 0.11, p < 0.01), and bloating (τ = 0.08, p = 0.02), but not with the frequency of bowel habit (τ = -0.04, p > 0.1, Table 3).
Table 3

Associations between the degree of anxiety and GI symptoms in subjects with IBS-C

GI symptoms/Degree of anxiety

None

Sometimes

Often

Always

Kendall’s τ

Abdominal discomfort

    

0.09**

 No (n = 271)

76

153

34

8

 

 Yes (n = 488, 64.3 %)

100

287

77

24

 

Abdominal pain

    

0.11**

 No (n = 538)

132

323

70

13

 

 Yes (n = 211, 29.1 %)

44

117

41

19

 

Abdominal bloating

    

0.08*

 No (n = 151)

42

91

13

5

 

 Yes (n = 608, 80.1 %)

134

349

98

27

 

Abdominal distention

    

0.11**

 No (n = 368)

94

224

39

11

 

 Yes (n = 391, 51.5 %)

82

216

72

21

 

Sensation of excessive gas

    

0.11**

 No (n = 218)

65

122

25

6

 

 Yes (n = 541, 71.3 %)

111

318

86

26

 

Tightness in the abdomen

    

0.11**

 No (n = 408)

108

237

52

11

 

 Yes (n = 351, 46.2 %)

68

203

59

21

 

Abdominal fullness

    

0.08*

 No (n = 636)

157

364

92

23

 

 Yes (n = 123, 16.2 %)

19

76

19

9

 

Borborygmus

    

0.06

 No (n = 626)

148

367

91

20

 

 Yes (n = 133, 17.5 %)

28

73

20

12

 

Increase in passing of gas

    

0.08*

 No (n = 369)

99

208

48

14

 

 Yes (n = 390, 51.4 %)

77

232

63

18

 

Decrease in passing of gas

    

0.01

 No (n = 736)

172

425

109

30

 

 Yes (n = 23, 3.0 %)

4

15

2

2

 

Incomplete evacuation

    

0.00

 No (n = 326)

72

198

41

15

 

 Yes (n = 433, 57.0 %)

104

242

70

17

 

Urgency

    

0.04

 No (n = 673)

156

397

95

25

 

 Yes (n = 86, 11.3 %)

20

43

16

7

 

Sensation of anorectal obstruction/blockage

    

0.01

 No (n = 348)

86

194

54

14

 

 Yes (n = 411, 54.2 %)

90

246

111

18

 

Frequency of bowel habit in a week

    

−0.04

  > 1 time (n = 15)

3

8

3

1

 

 1 time (n = 60)

6

39

12

3

 

 2 times (n = 156)

37

94

19

6

 

 3 times (n = 152)

40

78

25

9

 

 4 times (n = 85)

22

49

11

3

 

 5 times (n = 79)

17

48

11

3

 

 6 times (n = 52)

12

31

7

2

 

 7 times (n = 111)

26

61

20

4

 

 8 times or more (n = 49)

13

32

3

1

 

*p < 0.05, **p < 0.01, the Kendall’s τ-b

As shown in Fig. 1 and Table 4, the most bothersome symptom in subjects with IBS-C was abdominal bloating (27.5 %, 163 females and 46 males), which was more likely to occur after a meal (52.2 %), at work/school (29.2 %), during times of stress (26.8 %) and during menstruation (11.7 %, females only). Only 4.5 % of IBS-C subjects (25 females and 9 males) reported abdominal pain as the most bothersome symptom, which was more likely to occur after a meal (26.5 %), at work/school (29.4 %), during times of stress (29.4 %) and during menstruation (48.0 %, females only). IBS-C subjects were more likely to report that the bothersome symptoms usually occur throughout the day or during a non-specific period of time rather than at a regular time during the day (data were not shown).
Fig. 1

The frequencies of the most bothersome symptom reported by subjects with IBS-C (n = 759)

Table 4

Occurrence situations of the ‘most bothersome’ symptom in subjects with IBS-C

Situations/Symptoms

Abdominal bloating (n = 209)

Abdominal discomfort (n = 116)

Sensation of anorectal obstruction/blockage (n = 95)

Sensation of excessive gas (n = 87)

Increase in passing of gas (n = 59)

Incomplete evacuation (n = 51)

Abdominal distention (n = 41)

Abdominal pain (n = 34)

On the way to work/school by bus or train

18.2

21.6

4.2

23.0

35.6

9.8

14.6

5.9

At work/school

29.2

25.9

11.6

43.7

45.8

17.6

31.7

29.4

During a conference presentation/an exam

5.7

10.3

2.1

9.2

5.1

3.9

7.3

8.8

After drinking alcohol

2.4

6.9

3.2

5.7

6.8

0

2.4

0

After drinking milk

2.9

5.2

3.2

4.6

3.4

0

4.9

11.8

After a meal

52.2

43.1

22.1

26.4

39.0

21.6

43.9

26.5

On a sightseeing trip

24.4

13.8

20.0

18.4

11.9

11.8

14.6

8.8

On a business trip

3.3

6.9

6.3

3.4

1.7

2.0

7.3

2.9

During time of stress

26.8

31.9

25.3

28.7

25.4

27.5

31.7

29.4

After taking some drugs

2.9

1.7

8.4

0

0

0

2.4

5.9

During menstruation (females only)

11.7

16.2

8.3

4.6

12.2

11.4

3.6

48.0

Only symptoms which at least 30 subjects reported were shown. Data were expressed as frequencies (%) in each symptom

Discussion

We conducted a large-scale Internet survey investigating 30,000 adults from the general public throughout Japan. In this study, we estimated frequencies of the subtypes of IBS using the Rome III diagnostic questionnaire [16, 17], and then investigated what is the most bothersome symptom and what factors in the daily life exaggerate the dominant symptoms among subjects with IBS-C. As long as we know, this is the first report on a large number of subjects diagnosed as IBS-C demonstrating that the degree of anxiety in their daily lives is not always associated with frequency of bowel movement. Furthermore, we also found that the most bothersome symptom, abdominal bloating, occurs most often after meal, subsequently at work or school and during time of stress in subjects with IBS-C.

The sensation of abdominal bloating may affect 10 to 30 % of healthy subjects and up to 96 % of patients with IBS [9]. Abdominal bloating is more often noted by females with IBS than males, with symptoms increasing in relation to menses [18]. Abdominal bloating is associated with decreased QOL and may cause a higher number of physician visits [19]. Indeed, the IBS symptom severity scale (IBS-SSS) [20], which is widely used to assess the severity of IBS, consists of the item on the severity score for abdominal bloating as well as abdominal pain. However, the presence of abdominal bloating in other functional GI disorders and even in healthy subjects [19] means that it is not necessarily considered a diagnostic criterion for IBS.

‘Abdominal bloating’ is not always a specific term that implies both to the subjective sensation and to the objective or ‘visible’ abdominal distention [21]. In the present study, the symptom descriptions in Japanese, ‘abdominal bloating’, ‘abdominal distention’, ‘sensation of excessive gas’, ‘tightness in the abdomen’ and ‘abdominal fullness’ were used as independent symptomatic items on the main questionnaire. In our findings, the most common symptom of these 5 terms which IBS subjects expressed during constipation was abdominal bloating and the fewest was abdominal fullness (see Table 3).

Previous findings of abdominal girth using plethysmography [21, 22] may support our results of different frequencies of abdominal bloating and distention in subjects with IBS-C. Using this technique it has been demonstrated that most patients who have abdominal distention also report abdominal bloating and that patients with bloating alone have lower sensory thresholds in the rectum compared to healthy subjects, whereas those with abdominal bloating and distention have normal or slightly higher sensory thresholds [21]. On the other hand, it has been reported that increase in abdominal girth in a day directly correlated with orocecal and colonic transit times, and inversely with stool consistency [22]. Therefore, abdominal bloating alone may be more reflection of visceral hypersensitivity, whereas abdominal bloating with distension may be more of a peripheral physiological problem.

In our subjects with IBS-C, the degree of anxiety in their daily lives was associated with severity of abdominal pain, discomfort and bloating, but not with frequency of bowel movement. It has been demonstrated that IBS patients feel more stress which may exaggerate IBS symptoms such as abdominal pain compared to healthy subjects [5]. In patients with IBS, psychological or physiological stimulus (i.e., stress) alters both visceral perception (mostly, hypersensitivity) [2325] and colonic motility (mostly, hypercontractility even in IBS-C) [26, 27]. However, it has been reported that only 11.5 % of patients with IBS-C showed delayed colonic transit [11]. In addition, no relationship has been detected between stress factors and colonic transit in IBS patients [28]. These findings suggest that lower frequency of bowel movement in IBS-C may not always reflect inhibition of bowel movement by stress.

IBS patients often relate their symptoms to the intake of certain foods. IBS symptoms such as abdominal pain and bloating occur or are exacerbated postprandially in approximately two-thirds of patients [3, 4]. We have previously reported that female subjects with IBS had more irregular meals and skipped meals more frequently compared to non-IBS subjects in nursing and medical school students [29]. Furthermore, IBS patients showed an exaggerated sensory component of the gastrocolonic response, expressed as lowered colonic perception thresholds and increased viscerosomatic referral area for abdominal pain after duodenal lipid infusion [30]. On the other hand, an intestinal transit study using scintigraphy revealed that IBS-C patients showed normal ileocolonic transit but somewhat delayed colonic transit in response to meal ingestion [31]. We have also demonstrated that meal ingestion did not induce altered colonic motility response in patients with IBS-C [27]. Therefore, exaggerated abdominal boating in IBS-C subjects after the meals in this study may be due to increased visceral perception, increased gut contractions and impaired propulsive movement in response to the nutritions.

A limitation of our study was to use the Internet-based survey. Subjects who were interested in own health might be more likely to participate in this survey. In the present study, 30,000 samples were collected from the large monitor panel throughout Japan and set same numbers of sex and several aged group flames. Therefore, we believe ascertainment bias is unlikely because the prevalence of overall IBS and IBS-C using the Rome III diagnostic criteria was similar to what has been reported previously for Japan [32, 33] or the other countries [34, 35]. Another limitation was that we did not investigate whether the presence of an organic GI disease and/or the other comorbid disease. It has been reported that IBS patients have more somatic/psychiatric comorbidities which may affect their daily lives compared to non-IBS subjects [36].

To summarize, a large population-based Internet survey has shown that a number of similarities between the Western countries and Japan, including a similar prevalence of IBS-C and a similar frequency of abdominal bloating in subjects with IBS-C. We have also shown important similarities with the previous surveys including a similar association of severity of abdominal pain with the degree of anxiety and a similar association of occurrence/exaggeration of IBS symptoms with meal ingestion and with perceived stress. Thus, these trigger factors are considered to be generalizable even in IBS-C. In constant, a significant association of frequency of bowel movement with the degree of anxiety has failed to be observed in IBS-C subjects.

Conclusions

Our findings suggest that abdominal bloating has a great impact on the daily lives of subjects diagnosed with IBS-C. Not only bowel movement/abdominal pain but also abdominal bloating should be evaluated in patients with IBS-C.

Abbreviations

GI, gastrointestinal; IBS, irritable bowel syndrome; IBS-C, IBS with constipation; IBS-D, IBS with diarrhea; IBS-M, mixed IBS; IBS-U, unspecified IBS; QOL, quality of life.

Declarations

Acknowledgements

The authors wish to thank Macromill, Inc. for data collection and supporting data analysis.

Funding

This study was supported by Research Grant from Astellas Pharma Inc., Tokyo, Japan.

Authors’ contributions

SF: the guarantor of this paper. SF, HM, AN, MaK and HA designed the study and critically reviewed the paper; and MoK performed data analysis, interpretation of the results and drafting the paper. All authors have approved the final manuscript.

Competing interests

The authors disclose the following: Motoyori Kanazawa has no conflict of interest; Shin Fukudo and Hiroto Miwa are recipient of research grant from Astellas Pharma, Inc. unrelated to this study; and Ayako Nakagawa, Masanori Kosako and Hiraku Akiho are employees of Astellas Pharma, Inc.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Behavioral Medicine, Tohoku University Graduate School of Medicine
(2)
Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine
(3)
Japan-Asia Clinical Development 2, Astellas Pharma Inc

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