Irritable Bowel Syndrome
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40 free Irritable Bowel Syndrome trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Irritable bowel syndrome is one of the most common reasons people see a digestive specialist, and one of the least understood. It causes real discomfort and disruption without leaving visible damage in the gut, which is why its story involves nerves, microbes, food chemistry and the way the brain and the bowel talk to each other. This quiz covers the condition from every side: the symptoms and subtypes, the checklists and tests doctors use to tell it apart from look-alike diseases, the science of gut sensitivity and gut microbes, and the diets, medicines and therapies that help. A few questions look at the history of the diagnosis and the people and places behind the tools used today. It suits nursing and medical students, nutrition and health science classes, and anyone living with the condition who wants to test what they know. Every answer comes with a short explanation. The quiz is for learning and is not medical advice.
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Q 01Which over-the-counter drug for IBS with diarrhea, sold as Imodium, is technically an opioid?
Loperamide
Loperamide acts on opioid receptors in the gut wall but does not cross into the brain at normal doses, so it slows the bowel without a high.
Q 02About 90% of which chemical messenger, a target of several IBS drugs, is made in the gut?
Serotonin
Serotonin is mostly made by cells in the gut lining, where it regulates the movement of the bowel rather than mood.
Q 03Which herb's oil, taken in coated capsules, beat a placebo at easing IBS symptoms?
Peppermint
Peppermint oil capsules are coated to pass through the stomach intact, because chewing or breaking one can bring on acid reflux.
Q 04People with IBS are about three times more likely to have surgery on which organ, often needlessly?
Gallbladder
Gallbladder removal is more common in IBS because the cramps get blamed on gallstones the person happens to have.
Q 05In the Western world, irritable bowel syndrome is about twice as common in which group of people?
Women
Women in Western countries are diagnosed about twice as often as men, yet studies in East Asia find no such gap between the sexes.
Q 06Which illness raises the risk of IBS about six-fold, causing the post-infectious form?
Gastroenteritis
Gastroenteritis triggers roughly one in ten cases of IBS, and a prolonged fever during the infection pushes the risk higher still.
Q 07Which network of neurons in the gut wall, studied in IBS, is nicknamed the second brain?
Enteric nervous system
Enteric nervous system neurons number about 500 million, and they keep the gut working even when the main nerve link to the brain is cut.
Q 08Doctors diagnose IBS with symptom criteria named after which European capital city?
Rome
Rome lends its name to the criteria, but the foundation that writes and updates them is based in Raleigh, North Carolina.
Q 09The stool form chart doctors use to sort IBS into subtypes is named after which English city?
Bristol
Bristol Royal Infirmary doctors devised the chart, which sorts stools into seven types from hard lumps to entirely liquid.
Q 10Researchers at which Melbourne institution developed the low-FODMAP diet used for IBS?
Monash University
Monash University researchers also lab-test everyday foods for their FODMAP content and publish the results in a phone app.
Q 11Which symptom must be present, alongside changed bowel habits, for a doctor to diagnose IBS?
Abdominal pain
Abdominal pain is the one symptom the checklist insists on, typically at least once a week over the last three months.
Q 12Because IBS leaves no visible damage in the gut, doctors class it as which kind of disorder?
Functional
Functional gut disorders have a newer official name, disorders of gut-brain interaction, because the problem lies in how the two work together.
Q 13Which condition joins ulcerative colitis as a main type of IBD, an illness often mistaken for IBS?
Crohn's disease
Crohn's disease inflames the gut wall, which is the key difference: IBS produces similar symptoms but no inflammation of that kind.
Q 21Which barely absorbed antibiotic, used mainly for travelers' diarrhea, is also prescribed for IBS?
Rifaximin
Rifaximin stays in the gut instead of entering the bloodstream, and it may ease IBS by resetting the mix of bacteria living there.
Q 22Which drug for IBS with constipation is sold as Constella in many countries outside the US?
Linaclotide
Linaclotide, sold as Linzess in the US, mimics peptides the gut makes for itself and stays in the digestive tract after it is swallowed.
Q 23Which IBS drug, sold as Lotronex, was withdrawn within a year and later returned with restrictions?
Alosetron
Alosetron was pulled after reports of life-threatening bowel complications, then came back when patient groups lobbied for its return.
Q 14Guidelines say everyone with IBS symptoms should be tested for which autoimmune condition?
Celiac disease
Celiac disease can pass for IBS, and a low-FODMAP diet may hide it, because cutting back on wheat eases the symptoms without a diagnosis.
Q 15Breath tests that rule out IBS look-alikes measure which gas, made in the body only by bacteria?
Hydrogen
Hydrogen in the breath after a sugary test drink shows the sugar was not absorbed and reached gut microbes instead.
Q 16In the past, doctors called IBS mucous colitis and which other name?
Spastic colon
Spastic colon was one of several old labels, and another, plain colitis, was misleading because IBS leaves no visible sign of damage or disease.
Q 17IBS subtypes include IBS-C and IBS-D, so what does the M in IBS-M stand for?
Mixed
Mixed bowel habits means that, on days with an abnormal bowel movement, more than a quarter of stools are hard and more than a quarter are loose.
Q 18Which breakfast grain does Britain's NHS suggest eating regularly to ease IBS bloating and cramps?
Oats
Oats supply soluble fiber, the kind that helps IBS, whereas the insoluble fiber in wheat bran can make symptoms worse.
Q 19Which sweetener, common in sugar-free gum, does Britain's NHS tell people with IBS to avoid?
Sorbitol
Sorbitol is a sugar alcohol that the gut absorbs poorly, and the advice to avoid it covers both bloating and diarrhea.
Q 20Which therapy is offered in a gut-directed form as a mental health treatment for IBS, alongside CBT?
Hypnotherapy
Hypnotherapy uses a relaxed, trance-like state, and there is some evidence that the gut-directed kind eases IBS symptoms and improves quality of life.
Q 24Which fiber supplement, made from the seed husks of Plantago plants, can improve IBS symptoms?
Psyllium
Psyllium is the active ingredient in Metamucil, and its soluble fiber both firms up loose stools and softens hard ones.
Q 25Which older antidepressant is prescribed at low doses for IBS, even to people who are not depressed?
Amitriptyline
Amitriptyline belongs to the tricyclic group, which helps about one in three people with IBS at doses too low to treat depression.
Q 26Which cranial nerve, key to the gut-brain axis in IBS, carries reports from the bowel to the brain?
Vagus
Vagus traffic runs in both directions, and gut microbes release molecules that can activate the nerve directly.
Q 27Which supplements does Britain's NHS suggest people with IBS try for a month?
Probiotics
Probiotics are live microorganisms, most often bacteria, similar to the ones that normally live in the digestive tract.
Q 28Which FODMAP carbohydrates, a problem for many people with IBS, are found in wheat, onions and garlic?
Fructans
Fructans, rather than gluten, are a suspected cause of the gut symptoms that some people blame on bread and pasta.
Q 29Which disaccharide makes regular milk a high-FODMAP food while hard cheese stays on the low-FODMAP list?
Lactose
Lactose need not be cut by everyone on the diet, since many people who benefit from going low-FODMAP do not need to restrict it.
Q 30Which professional may an NHS GP refer someone to when general lifestyle changes have not helped their IBS?
Dietitian
Dietitian supervision matters on a low-FODMAP plan because its strict phase is meant to last no more than about six weeks.