Irritable Bowel Syndrome

Irritable Bowel Syndrome

Last Updated June 26th, 2019

Overview

The gastrointestinal tract performs a number of vital functions in the human body. People having problems related to the gastrointestinal tract experience abnormalities related to digestion, metabolism and bowel movements. A very common disorder of the gastrointestinal tract is – “Irritable Bowel Syndrome”. It is a combination of digestive disorders, bowel incontinence, and metabolic syndromes. The reports of the International Foundation for Functional Gastrointestinal Disorders show that the occurrence of irritable bowel syndrome varies from 10-15% worldwide. Nearly 40% of these people exhibit mild symptoms, 35% exhibit moderate symptoms and 25% exhibit severe symptoms.

Definition

irritable bowel intestineIrritable bowel syndrome is a chronic medical condition which comprises the abnormalities in bowel movements accompanied by abdominal pain. It arises mainly due to functional abnormalities of the intestine. Under healthy conditions, the periodic contraction and relaxation of the intestine facilitate the motion of food along the digestive tract. In irritable bowel syndrome, contractility of the intestine is altered which results in numerous complications. Mainly the lower portion of the gastrointestinal tract is affected in this case. Irritable Bowel Syndrome is usually manifested as disturbed bowel movements, abdominal distension, and passage of gas. At present, nearly 40 million people all over the world are suffering from irritable bowel syndrome.

Difference between Irritable Bowel Syndrome and Inflammatory Bowel Disease

Patients are often confused between irritable bowel syndrome and inflammatory bowel disease. Irritable Bowel Syndrome is caused by abnormal functioning of the intestine. On the other hand, Inflammatory Bowel Disease is a kind of autoimmune disorder wherein the digestive tract is attacked by the immune system of the body itself.

Causes and risk factors of irritable bowel syndrome

Irritable bowel syndrome is caused by a number of factors. The most important ones are listed below-

  • Dysmotility: Dysmotility of the colon may alter the functions of the longitudinal and circular muscles. This results in abnormal propulsive movements, which leads to Diarrhoea or abnormal non-propulsive movements, which leads to Constipation. Increased colonic sensitivity results in these conditions. A person suffering from colonic dysmotility can simultaneously experience Constipation and Diarrhoea.
  • Hypersensitivity: Occurrence of infection or inflammation of the intestine or injury to the intestine can lead to increased sensitivity of the intestinal nerves. This, in turn, causes visceral hypersensitivity that may lead to irritable bowel syndrome. Psychological stress can also elicit a similar response (psychosomatic response).
  • Brain-gut connection: There is a close connection between the nerves of the intestine and the nerves constituting the Central Nervous System. A number of drugs or hormones can trigger the release of harmful chemicals (cytokines) within the body. These chemicals adversely impact the brain and the intestine. This leads to emotional stress causing irritable bowel syndrome and vice versa.
  • Muscles: Mechanical injury or hemorrhoid surgery may lead to the severe damage of the sphincter muscles in some cases. This causes incomplete closure of the anus, which leads to involuntary passage of stool. This gives rise to chronic diarrhea.
  • Nerves: A history of trauma or any injury to the Central Nervous System can cause damage of the parasympathetic nerves responsible for bowel movements. In most cases, the pelvic splanchnic nerve is affected. This leads to the abnormal functioning of the anal sphincter muscles, which precipitates irritable bowel syndrome.
  • Rectal dysfunctions: Two major categories of rectal dysfunctions have been identified so far, which contribute to irritable bowel syndrome. These are- Rectal Prolapse and Rectocele. In Rectal Prolapse, the rectum pushes into the anus, causing incomplete closure of the anal sphincter muscles. In Rectocele, the rectum protrudes into the vagina due to the weakening of the muscles separating them. In this condition, a portion of the fecal matter is retained even after a bowel movement. Rectal surgery or some chronic inflammatory bowel disease such as Crohn’s disease can cause stiffening of the rectal walls, which may also lead to irritable bowel syndrome.
  • Injuries: Injuries to the rectal muscles or nerves may occur due to childbirth (normal delivery through the vagina), surgical instrumentation or mechanical trauma. Irritable bowel syndrome may arise due to any of these conditions.
  • Aging: Degeneration of sphincter muscles and the nerves in the vicinity of the rectum may occur with age. This leads to irritable bowel syndrome in elderly people.
  • Ethnicity: Caucasians are the common vulnerable groups of irritable bowel syndrome due to their dietary habits.
  • Diet: Daily diet abundant in raw fruits and vegetables, whole wheat product, artificial sugar, and fructose can precipitate irritable bowel syndrome. Excess consumption of caffeinated beverages should also be reduced to prevent bowel incontinence.
  • Substance abuse: Active smokers and alcoholics are more likely to develop irritable bowel syndrome due to the progressive degeneration of the mucosal linings of the intestinal tract.

Symptoms of irritable bowel syndrome

Irritable Bowel SyndromeIrritable bowel syndrome has the following common symptoms-

  • Accumulation of excess gas in the alimentary canal, leading to flatulence
  • Pain and discomfort in the abdomen
  • Abdominal bloating
  • Involuntary leakage of mucus and fecal matter
  • Passage of gas with an unpleasant smell
  • Difficulty passing stool
  • Feeling of rectal fullness (due to retention of stool) even after a bowel movement
  • Slimy sensation in the anus even after wiping
  • Suppressed urination

 

Types of irritable bowel syndrome

Irritable bowel syndrome has two main categories

  • Diarrhea: In this condition, an uncontrolled passage of stool occur a number of times in a day. The patients may suffer from dehydration after repeated bouts of Diarrhoea.
  • Constipation: Here, the patient experiences difficulty passing stool due to extreme hardening of the stool. The stool may contain blood in some cases.

Diagnosis

The following laboratory examinations are usually carried out-

  • Defecography
  • Colonoscopy
  • Abdominal X-ray
  • Stool culture
  • Blood test
  • Hydrogen breath test

Low FODMAP for IBS

FODMAP is a collection of short-chain carbohydrates that include:

  • Fermentable – These can be broken down in the large intestine by bacteria.
  • Oligosaccharides – These are individual sugars that are joined in a chain. ‘Oilgo’ meaning ‘few’ and ‘saccharide’ meaning ‘sugar’.
  • Disaccharides – Double sugar molecules. ‘Di’ meaning two.
  • Monosaccharides – ‘mono’ meaning single. These are single sugar molecules.
  • And Polyols – These are sugar alcohols.

These food groups tend to increase digestive strain if these aren’t broken down properly in the large intestine. They absorb water and release gas that expands the intestinal tract causing pain and bloating. A low FODMAP diet helps in relieving symptoms of digestive issues such as :

  • Irritable bowel syndrome (IBS)
  • Other forms of functional gastrointestinal disorders (FFID)
  • Small intestinal bacterial growth (SIBG)
  • Certain autoimmune conditions such as rheumatoid arthritis, eczema or multiple sclerosis.
  • Health issues that may have been triggered to certain foods.
  • Inflammatory bowel disease (IBD)

Those who have been diagnosed with IBS will be advised to go on a low-FODMAP diet to help ease their symptoms. Based on a study conducted in ‘clinical and experimental gastroenterology’, it was found that 86% of those who were diagnosed with IBS felt their symptoms improve upon taking up a low-FODMAP diet.

Treatment and Prevention

Irritable Bowel Syndrome painIBS cannot be treated with just treatment method. It usually requires a combination of several different treatment techniques such as:

  • Lifestyle and dietary changes are at the crux of treating IBS. This includes refraining from caffeine, adding more fiber to your diet, and avoiding tobacco consumption.
  • Also, one should limit the amount of dairy products consumption, except for probiotic yogurt.
  • Stay away from trigger foods such as wheat, red wine, milk, red peppers etc.
  • Medications include psyllium husk ( that adds bulk to the stool) and antibiotic drugs if there is a bacterial infection in the intestines.
  • Drugs that treat constipation and abdominal pain are also prescribed.

Preventing IBS includes:

  • Eating a low-fat diet.
  • Staying away from spicy foods.
  • Limiting dairy consumption.
  • Consuming healthy fibers and probiotics
  • Managing stress
  • Not indulging in alcohol consumption and smoking

Facts

  • Certain environmental factors such as exposure to stress and childhood abuse can add to the risk of irritable bowel syndrome.
  • It affects around 25-45 million Americans, where 2 out of every 3 patients are female.

Facts

  • Globally it affects 10-15% of the entire population, with most patients being under the age of 50.
  • IBS is different from IBD (irritable bowel disorder). The latter occurs in case of Crohn’s disease and ulcerative colitis.

Facts

  • 1 out of every 5 patients of IBS also suffer from other gastrointestinal disorders such as GERD, dyspepsia, &    The list also extends to other conditions such as migraines, sexual disorders, and overactive bladder.

Related Conditions

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Dos and Don'ts

Dos
  • Eat a diet rich in fresh fruits and vegetables. Eat vitamin B12 rich foods such as whole grains and legumes.
  • Also, consume healthy amounts of probiotics. These will help in keeping the gut flora healthy that smooth digestion.
  • Exercise regularly and learn how to effectively manage stress.
Don'ts
  • Consume large meals in one sitting and lie down immediately after the meals.
  • Indulging in overeating or eating too quickly (eating in a rush).
  • Consume foods that are rich in refined flour, sugar, preservatives, and artificial coloring.

 

 

 

 

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