Understanding Microscopic Colitis and Its Effects on Digestive Health

Written by Medicover Team and Medically Reviewed by Dr Raosaheb Rathod , Gastroenterologists Medical

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Microscopic colitis is a relatively common cause of chronic diarrhea, especially among older adults. Despite its prevalence, it often goes undiagnosed because the inflammation is only visible under a microscope and requires a biopsy for confirmation.

This guide explains microscopic colitis, including its symptoms, causes, diagnosis, treatment options, recovery, and long-term management.

What is Microscopic Colitis?

Microscopic colitis is an inflammatory bowel disease (IBD) that causes chronic, non-bloody, watery diarrhea. Unlike other forms of colitis, the colon often appears normal during colonoscopy, and the inflammation can only be detected by examining tissue samples under a microscope. The two main types are collagenous colitis and lymphocytic colitis, which have similar symptoms but different microscopic features.

Collagenous Colitis

In collagenous colitis, a thick layer of collagen develops beneath the lining of the colon. This thickening interferes with water absorption, leading to persistent watery diarrhea.

Lymphocytic Colitis

Lymphocytic colitis is characterized by an increased number of lymphocytes (white blood cells) within the lining of the colon, causing inflammation and chronic diarrhea.

What are the Symptoms of Microscopic Colitis?

The most common symptom of microscopic colitis is chronic, watery diarrhea. Symptoms may vary in severity and often come and go.

Chronic watery diarrhea
Abdominal pain or cramping
Bloating
Nausea
Weight loss
Fatigue
Urgent bowel movements
Mild dehydration due to frequent diarrhea

Because these symptoms can resemble other digestive disorders, a biopsy is often necessary to confirm the diagnosis.

What Causes Microscopic Colitis?

The exact cause of microscopic colitis remains unknown, but several factors may contribute to its development.

Medications: Certain medications, including nonsteroidal anti-inflammatory drugs (NSAIDs), proton pump inhibitors (PPIs), selective serotonin reuptake inhibitors (SSRIs), and some blood pressure medications, have been associated with microscopic colitis.
Autoimmune Disorders: Conditions such as celiac disease, rheumatoid arthritis, and thyroid disorders increase the risk.
Infections: Bacterial or viral gastrointestinal infections may trigger inflammation.
Genetics: A family history of inflammatory bowel disease may increase susceptibility.
Smoking: Smoking has been linked to an increased risk, particularly in younger individuals.

When Should You See a Doctor for Microscopic Colitis?

Medical evaluation by a gastroenterologist is recommended if diarrhea persists, worsens, or affects your daily activities. You may also be treated by a primary care physician or an internal medicine specialist for initial evaluation and ongoing care. Early diagnosis can help control symptoms, prevent dehydration, and reduce the risk of long-term complications.

Persistent watery diarrhea lasting more than two to three weeks
Unexplained weight loss, fatigue, or weakness
Severe abdominal pain, cramping, or signs of dehydration
Symptoms that continue despite dietary changes or initial treatment
A history of autoimmune disease with ongoing digestive symptoms

Timely medical care supports effective treatment, symptom control, and improved long-term digestive health.

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How is Microscopic Colitis Diagnosed?

Diagnosing microscopic colitis involves evaluating symptoms and confirming inflammation through microscopic examination of colon tissue.

Medical History and Physical Examination

Your healthcare provider will review your symptoms, medications, medical history, and perform a physical examination.

Stool Tests

Stool tests help rule out infections and other causes of chronic diarrhea.

Colonoscopy with Biopsy

Although the colon often appears normal during colonoscopy, small tissue samples are collected from different parts of the colon. These biopsies are examined under a microscope to identify the characteristic inflammatory changes.

What is the Treatment for Microscopic Colitis?

Treatment focuses on reducing inflammation, relieving diarrhea, and preventing symptom recurrence.

Medications

Anti-diarrheal medications: Loperamide may help control diarrhea.
Corticosteroids: Budesonide is commonly used as the first-line treatment to reduce inflammation.
Immune-modifying medications: Medicines such as azathioprine may be considered when symptoms persist despite other treatments.

Dietary Changes

A low-fat, low-fiber diet may help reduce diarrhea. Limiting caffeine, alcohol, dairy products (if intolerant), and artificial sweeteners may also improve symptoms.

Medication Review

If a medication is suspected of triggering microscopic colitis, your healthcare provider may recommend stopping or changing it.

Probiotics

Some people may benefit from probiotics, although research regarding their effectiveness is still ongoing.

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Microscopic Colitis vs. Ulcerative Colitis

Although both are inflammatory bowel diseases, microscopic colitis and ulcerative colitis differ significantly.

Microscopic Colitis: Inflammation is visible only under a microscope and usually causes chronic watery diarrhea without bleeding.
Ulcerative Colitis: Causes visible ulcers and inflammation throughout the colon and rectum and commonly results in bloody diarrhea.

What are the Pathological Features of Microscopic Colitis?

The diagnosis is confirmed by characteristic microscopic changes found in biopsy specimens.

Collagenous Colitis: Thickened subepithelial collagen layer with chronic inflammation in the lamina propria.
Lymphocytic Colitis: Increased intraepithelial lymphocytes with chronic inflammation in the lamina propria.

These microscopic findings cannot usually be seen during colonoscopy, making biopsy essential for diagnosis.

Living with Microscopic Colitis

With proper treatment and lifestyle modifications, most people can successfully manage microscopic colitis and maintain a good quality of life.

Attend regular medical follow-up appointments.
Stay well hydrated to prevent dehydration.
Follow dietary recommendations provided by your healthcare provider.
Take prescribed medications consistently.
Seek emotional support through family or support groups if needed.

What is the Recovery Process for Microscopic Colitis?

Recovery depends on the severity of the condition, underlying triggers, and response to treatment. Most individuals experience significant symptom improvement with appropriate medications, dietary adjustments, and regular medical follow-up.

Improvement in diarrhea after starting treatment
Regular follow-up appointments to monitor progress
Maintaining hydration and balanced nutrition
Avoiding medications or foods that trigger flare-ups
Long-term symptom control through ongoing management

Why Choose Medicover Hospitals for Microscopic Colitis Treatment?

Medicover Hospitals offers comprehensive care for microscopic colitis through experienced gastroenterologists, advanced diagnostic facilities, including colonoscopy with biopsy, and personalized treatment plans. Our multidisciplinary approach focuses on accurate diagnosis, effective symptom control, nutritional guidance, and long-term follow-up to help patients achieve lasting digestive health and an improved quality of life.