Why Do I Keep Getting Bloating, Constipation or Diarrhea? IBS (Irritable Bowel Syndrome) Explained

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Why Do I Keep Getting Bloating, Constipation or Diarrhea? IBS (Irritable Bowel Syndrome) Explained

Do you often experience abdominal pain, bloating, constipation, diarrhea, or a combination of both—without knowing why? If these symptoms keep returning despite normal medical tests, you may have Irritable Bowel Syndrome (IBS).

IBS is one of the most common digestive disorders worldwide. Although it does not damage the intestines or increase the risk of bowel cancer, it can significantly affect quality of life, work, sleep, and emotional wellbeing.

The good news is that many people can successfully manage IBS through dietary changes, stress management, appropriate medications, and targeted supplements.

This evidence-based guide explains the symptoms, causes, diagnosis, treatment options, and practical lifestyle strategies for living with IBS.

What Is Irritable Bowel Syndrome (IBS)?

Irritable Bowel Syndrome (IBS) is a chronic functional gastrointestinal disorder, meaning the digestive tract looks normal but does not function normally.

People with IBS have increased sensitivity of the intestines and altered bowel movements, leading to recurrent abdominal pain and changes in stool frequency or consistency.

Unlike inflammatory bowel disease (IBD), IBS does not cause inflammation, ulcers, bleeding, or permanent damage to the intestines.

Types of IBS

IBS is classified according to the predominant bowel habit.

IBS-C

(Constipation-predominant)

Common symptoms include:

  • Hard stools
  • Infrequent bowel movements
  • Straining
  • Bloating
  • Abdominal discomfort

IBS-D

(Diarrhea-predominant)

Symptoms include:

  • Loose stools
  • Urgent bowel movements
  • Frequent diarrhea
  • Cramping

IBS-M

(Mixed IBS)

People alternate between constipation and diarrhea.

This is one of the most common forms of IBS.

IBS-U

(Unclassified)

Symptoms do not fit neatly into the other categories.

Symptoms of IBS

Symptoms vary from person to person.

Common symptoms include:

  • Abdominal pain
  • Cramping
  • Bloating
  • Excess gas
  • Constipation
  • Diarrhea
  • Alternating constipation and diarrhea
  • Feeling that the bowel has not emptied completely
  • Mucus in the stool

Many people notice that symptoms improve after a bowel movement.

Symptoms often come and go in episodes (“flare-ups”).

What Causes IBS?

The exact cause remains unknown, but several factors appear to contribute.

Gut-Brain Axis

The intestines and brain constantly communicate through the gut-brain axis.

Stress, anxiety, and emotional distress may alter bowel function and increase pain sensitivity in some people with IBS.

Changes in Gut Motility

Some people have bowel movements that are too slow, while others experience bowel contractions that are too rapid.

Increased Gut Sensitivity

People with IBS often experience greater sensitivity to normal intestinal stretching caused by gas or stool.

Altered Gut Microbiome

Growing evidence suggests that changes in the balance of intestinal bacteria (dysbiosis) may contribute to IBS symptoms in some people.

Previous Gastrointestinal Infection

Some people develop post-infectious IBS after recovering from food poisoning or viral gastroenteritis.

Food Triggers

Common dietary triggers include:

  • Fatty foods
  • Coffee
  • Alcohol
  • Spicy foods
  • Carbonated drinks
  • Onions
  • Garlic
  • Certain fruits
  • Artificial sweeteners

Triggers differ from person to person.

Keeping a food diary may help identify individual triggers.

Risk Factors

IBS is more common in:

  • Women
  • People younger than 50 years
  • Those with a family history of IBS
  • People experiencing chronic stress or anxiety
  • Individuals who have had a severe gastrointestinal infection

How Is IBS Diagnosed?

There is no single test that confirms IBS.

Doctors usually diagnose IBS based on:

  • Typical symptoms.
  • Physical examination.
  • Medical history.
  • The Rome IV diagnostic criteria.

Further tests may be recommended to rule out other conditions if symptoms are unusual or warning signs are present.

When Should You See a Doctor?

Consult your doctor if you develop:

  • Blood in the stool.
  • Unexplained weight loss.
  • Persistent fever.
  • Night-time diarrhea that wakes you from sleep.
  • Severe anemia.
  • Symptoms beginning after age 50.
  • A strong family history of bowel cancer, inflammatory bowel disease, or celiac disease.
  • Persistent vomiting.
  • Severe abdominal pain that is not relieved by passing stool or gas.

These “alarm features” require further medical evaluation because they are not typical of IBS.

Treatment of Irritable Bowel Syndrome (IBS)

There is no single treatment that works for everyone with IBS. Management usually involves a combination of dietary changes, lifestyle modifications, stress reduction, medications, and, in some cases, supplements.

The best approach depends on whether constipation (IBS-C), diarrhea (IBS-D), or a mixture of both (IBS-M) is the predominant symptom.

Diet and Lifestyle

For many people, diet is one of the most important parts of managing IBS.

Rather than following a highly restrictive diet indefinitely, identifying personal trigger foods is usually more effective.

Keeping a food and symptom diary may help identify foods that trigger flare-ups.

Eat Regular Meals

Try to:

  • Eat at regular times.
  • Avoid skipping meals.
  • Eat slowly.
  • Chew food thoroughly.
  • Avoid very large meals.

Large meals may worsen bloating and abdominal pain.

Stay Hydrated

Drink enough water throughout the day.

Adequate hydration is particularly important for people with IBS-C (constipation-predominant IBS).

Limit excessive intake of:

  • Alcohol
  • Highly caffeinated drinks
  • Energy drinks

if they worsen your symptoms.

The Low-FODMAP Diet

Many people with IBS benefit from a low-FODMAP diet, which temporarily reduces certain fermentable carbohydrates that can trigger bloating, gas, abdominal pain, and changes in bowel habits.

Foods that are high in FODMAPs include:

  • Onions
  • Garlic
  • Wheat (for some people)
  • Certain fruits such as apples and pears
  • Milk (if lactose intolerance is present)
  • Beans
  • Some artificial sweeteners

The low-FODMAP diet should ideally be followed under the guidance of a registered dietitian, as it is intended to be a short-term elimination diet followed by the gradual reintroduction of foods to identify individual triggers.

It is not intended as a lifelong restrictive diet.

Fiber

Fiber can be helpful, but the type of fiber matters.

Soluble Fiber

Soluble fiber absorbs water and forms a gel, helping to regulate bowel movements.

Examples include:

  • Psyllium husk
  • Oats
  • Barley

Soluble fiber has the strongest evidence for improving IBS symptoms, particularly in IBS-C.

Insoluble Fiber

Insoluble fiber is found in:

  • Wheat bran
  • Some cereals

Although beneficial for many healthy people, it may worsen bloating and abdominal pain in some individuals with IBS.

Physical Activity

Regular exercise can improve bowel function, reduce stress, and improve overall wellbeing.

Aim for at least 150 minutes of moderate physical activity per week, such as:

  • Walking
  • Cycling
  • Swimming
  • Yoga

Even gentle daily movement may reduce IBS symptoms.

Stress Management

Stress does not cause IBS, but it can trigger or worsen symptoms.

Helpful strategies include:

  • Regular exercise
  • Meditation
  • Deep breathing exercises
  • Yoga
  • Good sleep habits
  • Cognitive behavioural therapy (CBT) for some individuals

Medications for IBS

Medication depends on the predominant symptoms.

IBS-C (Constipation)

Your healthcare professional may recommend:

  • Psyllium
  • Polyethylene glycol (PEG)
  • Prescription medications when appropriate

IBS-D (Diarrhea)

Possible treatments include:

  • Loperamide (for diarrhea control)
  • Bile acid binders (in selected cases)
  • Prescription medications when indicated

Abdominal Pain and Cramping

Antispasmodic medicines may help relieve intestinal muscle spasms.

Examples include:

  • Hyoscine butylbromide
  • Mebeverine
  • Peppermint oil capsules

Can Supplements Help IBS?

Many people with IBS are interested in natural approaches. Some supplements have stronger evidence than others.

Probiotics ⭐⭐⭐⭐

Research suggests that certain probiotic strains may help reduce:

  • Bloating
  • Excess gas
  • Abdominal discomfort
  • Irregular bowel habits

Benefits are strain-specific, and not every probiotic works the same way.

Clinical studies suggest that a trial of 4–12 weeks with a well-studied probiotic may be reasonable. If symptoms improve, some people choose to continue long term, while others may only need intermittent use. Individual responses vary.

Prebiotics ⭐⭐⭐

Prebiotics are fibers that nourish beneficial gut bacteria.

Examples include:

  • Inulin
  • Fructooligosaccharides (FOS)
  • Galactooligosaccharides (GOS)

Small amounts may support long-term gut health, but higher doses can increase gas and bloating, particularly during an IBS flare.

Introducing prebiotics gradually often improves tolerance.

Synbiotics ⭐⭐⭐⭐

Synbiotics combine:

  • Probiotics
  • Prebiotics

Some studies suggest they may provide greater benefit than probiotics alone in selected individuals, although more research is needed.

Peppermint Oil ⭐⭐⭐⭐⭐

Peppermint oil is one of the best-studied herbal treatments for IBS.

Enteric-coated peppermint oil capsules may reduce:

  • Abdominal pain
  • Cramping
  • Bloating

People with GERD should use peppermint oil cautiously, as it may worsen acid reflux.

Oregano Oil ⭐⭐

Oregano oil has antimicrobial properties and has been investigated for gastrointestinal disorders associated with alterations in the gut microbiota.

Although some small studies and clinical experience suggest it may benefit selected individuals, high-quality evidence remains limited. Because oregano oil may also affect beneficial bacteria, it should not replace evidence-based IBS treatment.

Some healthcare professionals recommend using oregano oil for a short course, followed by a clinically studied probiotic to support restoration of the gut microbiome. However, this approach has not yet been established in major clinical guidelines.

Digestive Enzymes ⭐⭐

Digestive enzymes are not a standard treatment for IBS, but some people report improvement, particularly when symptoms are related to specific food intolerances or difficulties digesting certain meals.

Amazon Products That May Help

⭐ High-Quality Multi-Strain Probiotic

Choose products containing clinically studied strains of Bifidobacterium and Lactobacillus.

⭐ Psyllium Husk

Excellent source of soluble fiber for IBS-C.

⭐ Enteric-Coated Peppermint Oil Capsules

May help reduce abdominal pain and cramping.

⭐ Low-FODMAP Cookbook

Helpful for people beginning a low-FODMAP diet under professional guidance.

⭐ Heating Pad

Can help relieve abdominal cramps during IBS flare-ups.

IBS in Children

Irritable bowel syndrome can also affect children and adolescents. Symptoms are similar to those seen in adults and may include:

  • Recurrent abdominal pain
  • Bloating
  • Constipation, diarrhea, or alternating bowel habits
  • Excess gas
  • Pain that often improves after a bowel movement

Stress, anxiety, changes in routine, and certain foods may contribute to symptom flare-ups, although IBS is not caused by psychological factors alone.

Parents should encourage:

  • A balanced, fiber-appropriate diet.
  • Adequate hydration.
  • Regular physical activity.
  • Healthy sleep habits.
  • Regular toilet routines.

Children should be assessed by a healthcare professional if they have:

  • Blood in the stool.
  • Persistent vomiting.
  • Unexplained weight loss or poor growth.
  • Fever.
  • Severe or persistent diarrhea.
  • Symptoms that wake them from sleep.
  • A family history of inflammatory bowel disease or celiac disease.

Most children with IBS can manage their symptoms successfully with reassurance, lifestyle changes, and individualized treatment when necessary.

Prevention

Although IBS cannot always be prevented, the following measures may help reduce flare-ups:

  • Eat regular meals.
  • Identify personal trigger foods.
  • Stay physically active.
  • Get adequate sleep.
  • Manage stress.
  • Drink enough water.
  • Avoid unnecessary use of antibiotics.
  • Maintain a healthy, varied diet to support the gut microbiome.

💊 Pharmacist’s Tip

IBS is a long-term condition, but it is manageable. Many people achieve the best results by combining dietary changes, stress management, and targeted supplements rather than relying on medication alone. In community pharmacy, it is common to see improvement when treatment is tailored to the individual’s symptoms—for example, using soluble fiber for IBS-C, appropriate probiotics for selected patients, or peppermint oil for abdominal cramping. Because responses vary, a period of trial and careful monitoring is often needed to find the combination that works best for you.

Can IBS turn into bowel cancer?

No. IBS does not increase the risk of bowel cancer or inflammatory bowel disease.

Is IBS contagious?

No. IBS is a functional gastrointestinal disorder and cannot be passed from one person to another.

Are probiotics good for IBS?

Certain probiotic strains may improve bloating, abdominal discomfort, and bowel regularity in some people. Benefits are strain-specific.

Can stress cause IBS?

Stress does not cause IBS, but it can trigger or worsen symptoms in many people.

Is the low-FODMAP/Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols/ diet safe?

Yes, when used correctly. Because it is an elimination diet, it should ideally be followed under the guidance of a registered dietitian and should not be unnecessarily prolonged.

Can children develop IBS?

Yes. IBS can occur in children and adolescents, but persistent symptoms or warning signs should always be evaluated by a healthcare professional.

Clinical Disclaimer

This article is intended for educational purposes only and should not replace professional medical advice. Consult your doctor or pharmacist if you have persistent abdominal pain, blood in the stool, unexplained weight loss, fever, persistent vomiting, symptoms that wake you from sleep, or significant changes in bowel habits. These symptoms require medical evaluation because they are not typical features of IBS.

Related Articles

References

  1. American College of Gastroenterology (ACG). Clinical Guideline: Management of Irritable Bowel Syndrome.
  2. British Society of Gastroenterology (BSG). Guidelines on the Management of Irritable Bowel Syndrome.
  3. National Institute for Health and Care Excellence (NICE). Irritable Bowel Syndrome in Adults.
  4. World Gastroenterology Organisation (WGO). Irritable Bowel Syndrome Global Guidelines.
  5. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Irritable Bowel Syndrome.
  6. European Society for Paediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN). Guidance on functional gastrointestinal disorders in children.
  7. Ford AC, et al. American Journal of Gastroenterology. Systematic reviews on dietary therapies and probiotics for IBS.

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