Ulcerative Colitis: Causes, Symptoms, Diagnosis, and Long-Term Management

What is Ulcerative Colitis?

Ulcerative colitis is a chronic inflammatory condition that affects the colon (large intestine) and rectum. It is one of the two main forms of inflammatory bowel disease (IBD), alongside Crohn’s disease. Unlike Crohn’s, which can affect any part of the digestive tract, ulcerative colitis is limited to the colon and involves continuous inflammation along the inner lining of the bowel.

This inflammation leads to ulceration (sores) in the intestinal wall, which can cause bleeding, discomfort, and disruption to normal digestive function. The condition typically follows a relapsing-remitting pattern, meaning periods of flare-ups are followed by times of remission.

Ulcerative colitis can range from mild to severe and may significantly impact quality of life if not properly managed. However, with the right combination of medical care and lifestyle strategies, many individuals can achieve long-term remission.

Symptoms of Ulcerative Colitis

Common symptoms include bloody diarrhoea, abdominal pain and cramping, urgency to have bowel movements, rectal bleeding, mucus in the stool, fatigue, reduced appetite, weight loss, and fever in more severe cases.

Some individuals may also experience symptoms outside the digestive system, including:

• Joint pain and swelling
• Skin conditions
• Eye inflammation
• Liver disorders

Symptoms are often classified as mild, moderate, or severe depending on bowel frequency, bleeding, pain severity, and the presence of systemic symptoms.

Causes of Ulcerative Colitis

The exact cause of ulcerative colitis is not fully understood, but it is widely accepted to involve a combination of immune, genetic, and environmental factors.

1. Immune System Dysfunction

Ulcerative colitis is driven by an inappropriate immune response in which the body mistakenly attacks the lining of the colon, causing ongoing inflammation.

2. Genetic Factors

A family history of IBD increases the likelihood of developing ulcerative colitis, suggesting a genetic predisposition.

3. Gut Microbiome Imbalance

Alterations in the gut microbiome may play a key role in triggering immune activation and sustaining inflammation.

4. Environmental Influences

Factors that may contribute include:

• Diet high in processed foods
• Antibiotic use
• Urban living environments
• Low fibre intake

5. Intestinal Barrier Dysfunction

A weakened gut lining may allow bacteria and toxins to stimulate the immune system, perpetuating inflammation.

Diagnosis of Ulcerative Colitis

Accurate diagnosis is important to distinguish ulcerative colitis from other gastrointestinal conditions.

A colonoscopy with biopsy is considered the gold standard diagnostic tool because it allows direct visualisation of inflammation and enables tissue sampling.

Additional testing may include:

• Blood tests to assess inflammatory markers, anaemia, and nutrient deficiencies
• Stool tests such as to evaluate intestinal inflammation and rule out infections
• Imaging studies including CT scans or MRI in certain cases

Conventional Treatment Options

Treatment aims to reduce inflammation, induce remission, and prevent relapse.

Anti-Inflammatory Medications

• Corticosteroids (short-term use)

2. Immunosuppressants

These help control the immune system response.

3. Biologic Therapies

Targeted treatments that block specific inflammatory pathways.

Functional Medicine Approach to Ulcerative Colitis

A functional approach focuses on identifying triggers and supporting the body’s ability to regulate inflammation

Personalised Nutrition

Diet can play an important role in symptom management and supporting long-term remission. Dietary approaches are often adjusted depending on whether symptoms are active or stable.

During Flare-Ups

Some individuals may tolerate simpler, easier-to-digest foods more comfortably during active inflammation, including:

• Low-fibre foods
• Easy-to-digest meals
• Avoiding raw vegetables and high-residue foods

During Remission

During remission, many people focus on more balanced anti-inflammatory dietary patterns involving:

• High-quality proteins
• Healthy fats
• Whole foods
• Gradual reintroduction of fibre where tolerated

Gut Health and Microbiome Support

Supporting gut health and microbiome balance may also form part of long-term symptom management strategies.

Approaches may include:

• Probiotics using carefully selected strains
• Prebiotics when tolerated
• Reducing dysbiosis and supporting microbial diversity

Some individuals also explore nutritional support strategies involving nutrients such as L-glutamine, omega-3 fatty acids, and zinc due to their potential roles in intestinal barrier support and inflammation regulation.

Stress and Nervous System Support

Chronic stress may worsen ulcerative colitis symptoms and flare-ups in some individuals. Stress-management strategies may help support nervous system regulation and overall wellbeing.

Helpful approaches may include:

• Meditation
• Breathwork
• Therapy
• Gentle exercise

Ulcerative Colitis Diet: What Helps and What to Avoid

Foods That May Help

Some individuals with ulcerative colitis may tolerate the following foods more comfortably, particularly during symptom flare-ups:

• Cooked vegetables
• Bone broth
• Lean proteins
• Healthy fats

Foods Some Individuals May Limit

Certain foods may worsen symptoms in some individuals, including:

• Alcohol
• Spicy foods
• Processed foods
• High-sugar foods