If you’re dealing with chronic, watery diarrhea, you might be wondering what is microscopic colitis. It’s a common cause of persistent diarrhea, especially in older adults, and understanding it is the first step toward feeling better.
This condition is an inflammatory bowel disease, but it’s different from Crohn’s or ulcerative colitis. The inflammation is only visible when a doctor examines a sample of your colon tissue under a microscope, which is how it gets its name. The symptoms can be disruptive, but effective treatments are available.
What Is Microscopic Colitis
Microscopic colitis is a condition where the lining of your large intestine (colon) becomes inflamed. This inflammation leads to persistent, watery diarrhea. Unlike other inflammatory bowel diseases, the colon looks completely normal during a standard colonoscopy. The diagnosis can only be confirmed by taking biopsies—tiny tissue samples—during the procedure and looking at them under a microscope.
There are two main types:
- Lymphocytic Colitis: Here, a specific type of white blood cell (lymphocytes) increases in the colon lining.
- Collagenous Colitis: In this type, a thick layer of collagen (a protein) forms beneath the colon lining.
The symptoms for both are very similar, and the treatment approaches overlap significantly.
What Causes Microscopic Colitis?
Doctors don’t know the exact cause, but they believe it’s related to an abnormal immune system response. Several factors are thought to trigger or contribute to this response:
- Medications: Certain drugs are strongly linked to the condition. These include common pain relievers like aspirin, ibuprofen, and naproxen, some acid-reducing medications (like PPIs), and certain antidepressants.
- Autoimmune Links: People with microscopic colitis often have other autoimmune disorders, such as celiac disease, thyroid disease, or rheumatoid arthritis.
- Bacterial or Viral Infections: Some cases may be triggered by an infection that jump-starts the inflammation.
- Genetic Factors: Having a family member with microscopic colitis or another IBD may increase your risk.
- Smoking: Tobacco use is a significant risk factor, particularly for developing the condition at a younger age.
Recognizing the Symptoms
The symptoms of microscopic colitis can come and go, and they vary from mild to severe. The most common signs include:
- Chronic, watery diarrhea (often occurring many times a day, including at night).
- Abdominal cramps or pain, which can be constant or come in waves.
- Urgency to have a bowel movement.
- Mild weight loss or dehydration from fluid loss.
- Bloating and gas.
Some people also experience nausea and fatigue. It’s important to note that blood in the stool is not typical for microscopic colitis and should be discussed with your doctor immediately.
How is it Diagnosed?
Since the colon looks normal during a colonoscopy, diagnosis requires a specific process. Here are the typical steps:
- Medical History and Physical Exam: Your doctor will ask about your symptoms, their duration, and any medications you take.
- Stool Tests: These are done to rule out infections, parasites, or other causes of diarrhea.
- Blood Tests: These check for signs of infection, inflammation, anemia, or vitamin deficiencies.
- Colonoscopy with Biopsy: This is the definitive test. While the colon lining appears normal to the eye, the doctor will take multiple small tissue samples from different areas. A pathologist then examines these biopsies under a microscope to look for signs of inflammation, increased lymphocytes, or a collagen band.
Treatment Options and Management
Treatment aims to reduce inflammation and relieve symptoms. The first step often involves lifestyle and medication changes.
- Review Your Medications: Your doctor may advise stopping or switching any drugs suspected of triggering your symptoms, especially NSAIDs (like ibuprofen). Never stop a prescribed medication without talking to your doctor first.
- Dietary Adjustments: While no specific diet cures microscopic colitis, some changes can help manage diarrhea.
- Try eating smaller, more frequent meals.
- Avoid caffeine, artificial sweeteners (like sorbitol and mannitol), dairy if you’re lactose intolerant, and high-fat foods, which can worsen symptoms.
- A low-FODMAP diet, done under a dietitian’s guidance, helps some people.
- First-Line Medications:
- Anti-diarrheals: Medications like loperamide (Imodium) can provide quick relief for mild symptoms.
- Budesonide: This is a corticosteroid that acts mainly in the gut with fewer side effects than other steroids. It’s often the first prescription treatment and is very effective for inducing remission.
- Other Medications: If budesonide doesn’t work or symptoms return, other options include:
- Mesalamine (5-ASA drugs).
- Immunomodulators (like azathioprine).
- Biologic therapies (like anti-TNF agents), though this is less common.
Most people with microscopic colitis respond well to treatment and can achieve long periods of remission. The condition does not increase your risk of colon cancer.
Living with Microscopic Colitis
Managing this condition is an ongoing process. Keeping a symptom diary can help you identify your personal triggers, whether they’re certain foods, stress, or medications. Staying hydrated is crucial because of the fluid loss from diarrhea. Work closely with your gastroenterologist to find the right treatment plan for you, and don’t hesitate to seek a second opinion if your symptoms aren’t improving. Remember, effective management is very achievable.
Frequently Asked Questions (FAQ)
Is microscopic colitis a serious disease?
While it causes significant discomfort and disrupts daily life, microscopic colitis is not life-threatening. It does not lead to colon cancer or increase your risk for it, which is a key difference from ulcerative colitis.
What is the difference between microscopic colitis and IBS?
Irritable Bowel Syndrome (IBS) is a functional disorder, meaning the bowel looks normal but doesn’t function correctly. Microscopic colitis involves actual inflammation visible under a microscope. Diarrhea in microscopic colitis is often more severe and persistent, and it responds to anti-inflammatory medications, whereas IBS treatments focus on symptom management.
Can microscopic colitis go away on its own?
Sometimes, especially if it was triggered by a medication that is then stopped, symptoms may resolve. However, for most people, it is a chronic condition with periods of flare-ups and remission. Treatment is usually necessary to control symptoms and achieve remission.
What foods should I avoid with microscopic colitis?
Common trigger foods include caffeine, alcohol, dairy (if lactose intolerant), fatty foods, spicy foods, and artificial sweeteners. A food diary is the best way to identify your personal triggers, as they can vary widely from person to person.
Is microscopic colitis curable?
There is no known permanent cure, but it is highly manageable. With the right treatment, many people achieve complete remission and can live without symptoms for long periods, sometimes even indefinitely. Ongoing management with your doctor is key to maintaining good health.