What is Microscopic Colitis? Symptoms, Causes, & Treatment

Microscopic colitis is a type of inflammatory bowel condition that causes chronic watery diarrhea. Unlike other forms of colitis, your colon looks completely normal during a colonoscopy, but under a microscope, inflammation becomes visible in the colon's lining.

This condition affects about 20 out of every 100,000 people, with women being more commonly affected than men. While the name might sound intimidating, microscopic colitis is manageable with proper treatment and rarely leads to serious complications.

What are the symptoms of microscopic colitis?

The main symptom of microscopic colitis is chronic watery diarrhea that lasts for weeks or months. This isn't your typical stomach bug that resolves in a few days.

Let's walk through the symptoms you might experience, starting with the most common ones:

• Watery diarrhea that occurs 3-20 times per day
• Abdominal cramping and pain, usually mild to moderate
• Urgency to have bowel movements
• Bloating and gas
• Fatigue from frequent bathroom trips and sleep disruption
• Weight loss due to poor nutrient absorption
• Dehydration if fluid loss is significant

Some people also experience less common symptoms like joint pain, skin rashes, or eye inflammation. These symptoms can come and go, with periods of remission followed by flare-ups that may last several months.

What are the types of microscopic colitis?

There are two main types of microscopic colitis, and they're named based on what doctors see under the microscope. Both types cause similar symptoms but have slightly different microscopic appearances.

Collagenous colitis occurs when a thick band of collagen builds up beneath the colon's surface. This collagen band is much thicker than normal, creating a barrier that affects how your colon absorbs water.

Lymphocytic colitis happens when too many lymphocytes (a type of white blood cell) collect in the colon's lining. These immune cells indicate ongoing inflammation, even though your colon looks normal from the outside.

Both types respond to similar treatments, and your doctor will determine which type you have through a biopsy during colonoscopy.

What causes microscopic colitis?

The exact cause of microscopic colitis isn't fully understood, but researchers believe it develops from a combination of factors. Your immune system likely plays a key role in triggering the inflammation.

Here are the main factors that may contribute to developing this condition:

• Autoimmune response where your immune system mistakenly attacks healthy colon tissue
• Certain medications, particularly NSAIDs like ibuprofen, proton pump inhibitors, and some antidepressants
• Bacterial or viral infections that trigger ongoing inflammation
• Genetic factors that make you more susceptible
• Bile acid malabsorption, which can irritate the colon lining
• Smoking, which significantly increases your risk

In rare cases, microscopic colitis can be linked to celiac disease, thyroid disorders, or exposure to certain toxins. However, many people develop the condition without any clear trigger, which can feel frustrating but is completely normal.

When should you see a doctor for microscopic colitis?

You should contact your doctor if you experience watery diarrhea that lasts longer than a few days, especially if it's disrupting your daily life. Early diagnosis can help prevent complications and get you feeling better sooner.

Seek medical attention promptly if you notice signs of dehydration like dizziness, dry mouth, or decreased urination. These symptoms suggest your body is losing too much fluid and needs immediate attention.

Call your doctor right away if you develop severe abdominal pain, blood in your stool, or high fever. While these symptoms are uncommon with microscopic colitis, they could indicate other serious conditions that need urgent care.

What are the risk factors for microscopic colitis?

Certain factors can increase your likelihood of developing microscopic colitis, though having risk factors doesn't guarantee you'll get the condition. Understanding these factors can help you and your doctor stay alert to symptoms.

The most significant risk factors include:

• Being female, as women are 3-9 times more likely to develop the condition
• Age over 50, with peak incidence in your 60s and 70s
• Smoking or a history of smoking
• Taking certain medications regularly, especially NSAIDs or PPIs
• Having autoimmune conditions like celiac disease, thyroid disorders, or rheumatoid arthritis
• Family history of inflammatory bowel disease

Less common risk factors include having undergone gallbladder surgery or taking certain psychiatric medications. If you have multiple risk factors, it doesn't mean you'll definitely develop microscopic colitis, but it's worth discussing with your doctor if you experience persistent digestive symptoms.

What are the possible complications of microscopic colitis?

Most people with microscopic colitis don't develop serious complications, but chronic diarrhea can lead to some health issues if left untreated. The good news is that these complications are usually preventable with proper management.

The most common complications you might face include:

• Dehydration from excessive fluid loss through diarrhea
• Electrolyte imbalances, particularly low potassium and sodium
• Malnutrition due to poor absorption of nutrients
• Weight loss that can become significant over time
• Fatigue and weakness from nutrient deficiencies
• Social isolation due to unpredictable bowel movements

Rarely, severe cases might lead to kidney problems from chronic dehydration or severe malnutrition requiring hospitalization. However, with proper treatment, most people avoid these serious complications entirely.

How can microscopic colitis be prevented?

While you can't completely prevent microscopic colitis, certain lifestyle changes may reduce your risk or help manage symptoms if you already have the condition. Prevention focuses on avoiding known triggers and maintaining overall colon health.

The most effective prevention strategies include quitting smoking, as this significantly reduces your risk of developing the condition. If you smoke, talk to your doctor about cessation programs that can help you quit safely.

Work with your doctor to review your medications, especially if you take NSAIDs or proton pump inhibitors regularly. Sometimes switching to alternative medications can reduce your risk without compromising your other health conditions.

Maintaining a healthy diet rich in fiber and staying well-hydrated supports overall colon health. Some people find that avoiding excessive caffeine and alcohol helps prevent digestive irritation.

How is microscopic colitis diagnosed?

Diagnosing microscopic colitis requires a colonoscopy with tissue biopsy because the condition can't be seen with the naked eye. Your doctor will need to examine colon tissue under a microscope to make the diagnosis.

The diagnostic process typically starts with your doctor reviewing your symptoms and medical history. They'll ask about your bowel movements, any medications you're taking, and whether you have other autoimmune conditions.

Blood tests may be ordered to check for signs of inflammation, anemia, or electrolyte imbalances. Your doctor might also test your stool to rule out infections or other causes of chronic diarrhea.

During the colonoscopy, your doctor will take small tissue samples from different areas of your colon. These biopsies are then examined under a microscope to look for the characteristic changes that indicate microscopic colitis.

What is the treatment for microscopic colitis?

Treatment for microscopic colitis focuses on reducing inflammation and controlling diarrhea to help you feel better and prevent complications. The good news is that most people respond well to treatment.

Your doctor will likely start with the gentlest approaches first:

1. Discontinuing medications that might be causing the problem, if possible
2. Anti-diarrheal medications like loperamide to reduce bowel movements
3. Budesonide, a corticosteroid that works locally in the colon with fewer side effects
4. Bile acid sequestrants if bile acid malabsorption is contributing
5. Probiotics to help restore healthy gut bacteria

For more severe cases, your doctor might prescribe stronger medications like systemic steroids, immunosuppressants, or biologics. These treatments are typically reserved for people who don't respond to first-line therapies.

In rare cases where medications don't work, some people benefit from fecal microbiota transplantation, though this is still considered experimental for microscopic colitis.

How can you manage microscopic colitis at home?

Home management plays a crucial role in controlling your symptoms and improving your quality of life. Simple dietary and lifestyle changes can make a significant difference in how you feel day to day.

Start by keeping a food diary to identify any triggers that worsen your symptoms. Common triggers include caffeine, spicy foods, high-fat meals, and artificial sweeteners, though triggers vary from person to person.

Stay well-hydrated by drinking plenty of water throughout the day, especially during flare-ups. Electrolyte drinks can help replace what you lose through diarrhea, but choose options without artificial sweeteners.

Eat smaller, more frequent meals rather than large ones, and consider following a low-FODMAP diet if certain foods seem to trigger symptoms. Some people find that avoiding gluten helps, even if they don't have celiac disease.

Plan your daily activities around bathroom access when symptoms are active. This might feel limiting, but it can reduce anxiety and help you maintain your normal routine as much as possible.

How should you prepare for your doctor appointment?

Preparing for your appointment helps ensure you get the most accurate diagnosis and effective treatment plan. Your doctor needs detailed information about your symptoms to help you effectively.

Keep a symptom diary for at least a week before your appointment, noting the frequency and consistency of bowel movements, any associated pain, and potential triggers. This information is incredibly valuable for your doctor.

Make a complete list of all medications, supplements, and vitamins you're taking, including over-the-counter items. Some medications can contribute to microscopic colitis, so this information is crucial.

Prepare a list of questions you want to ask, such as what tests you might need, treatment options available, and how to manage symptoms while waiting for results. Write down your questions beforehand so you don't forget them during the appointment.

What's the key takeaway about microscopic colitis?

Microscopic colitis is a manageable condition that, while uncomfortable, rarely leads to serious complications when properly treated. The chronic diarrhea and other symptoms can significantly impact your quality of life, but effective treatments are available.

Most people with microscopic colitis respond well to treatment and can return to their normal activities. While the condition may require ongoing management, many people experience long periods of remission with minimal symptoms.

The key to successful management is working closely with your healthcare team, being patient with the treatment process, and making lifestyle adjustments that support your overall health. Remember that this condition is not your fault, and with proper care, you can live a full, active life.