Ulcerative colitis is a long-term condition that inflames the colon and rectum. Symptoms come and go, and the disease can affect your work, sleep, and daily life. In this detailed guide, you will learn what ulcerative colitis is, what causes it, how doctors diagnose it, and how they treat it, along with diet tips and warning signs. For more reading, see WebMD and Mayo Clinic.
What Is Ulcerative Colitis?
In ulcerative colitis, the inner lining of your large intestine (colon) and rectum becomes inflamed and develops ulcers. The ulcers can bleed and produce pus and mucus. It is one of the two main types of inflammatory bowel disease (IBD). The other is Crohn’s disease. Ulcerative colitis usually starts in the rectum and spreads up the colon in a continuous pattern. It affects only the inner lining of the bowel.
The condition can start at any age, but most people are diagnosed between ages 15 and 35, and a smaller group is diagnosed after 60.
Symptoms of Ulcerative Colitis
Symptoms depend on how much of the colon is inflamed and how severe the inflammation is.
Bowel Symptoms
- Persistent diarrhea, often with blood or mucus
- Cramping belly pain, often in the lower left side
- A strong, urgent need to pass stool
- A feeling that you cannot empty your bowel completely
- Passing stool at night
General Symptoms
- Tiredness
- Weight loss and loss of appetite
- Fever during flare-ups
- Anemia from blood loss
Symptoms Outside the Bowel
Inflammation can also affect other parts of the body:
- Joints: pain and swelling
- Skin: painful red lumps or sores
- Eyes: redness, pain, or blurred vision
- Mouth: ulcers
- Liver: a related condition called primary sclerosing cholangitis
Symptoms come and go. During remission, symptoms fade, but the risk of a new flare remains.
How Severe Is It?
- Mild: fewer than four stools a day, little blood, and no fever
- Moderate: four to six stools a day with some blood and mild anemia
- Severe: more than six bloody stools a day, fever, a fast heartbeat, and anemia
Severe disease needs urgent hospital care.
Causes of Ulcerative Colitis
Doctors do not know the exact cause. They believe several factors work together:
- Genetics: A family history of IBD raises your risk.
- Immune system problems: The immune system may react wrongly to gut bacteria and keep the colon lining inflamed.
- Gut bacteria: People with ulcerative colitis often have a different mix of gut bacteria.
- Environmental triggers: Infections, antibiotics, diet, and stress may play a role.
Possible Triggers of Flares
- Stopping medicine without advice
- Stomach infections
- Anti-inflammatory pain medicines such as ibuprofen and diclofenac
- Stress and lack of sleep
- Some foods, which vary from person to person
Is Ulcerative Colitis an Autoimmune Disease?
Doctors call it an immune-mediated inflammatory disease. The immune system plays a major role in the inflammation. Experts still debate whether it meets every definition of an autoimmune disease, because researchers have not found one clear target that the immune system attacks.
Types of Ulcerative Colitis
Doctors group it by the area it affects:
- Ulcerative proctitis: inflammation only in the rectum. Symptoms are usually mild.
- Proctosigmoiditis: inflammation of the rectum and the lower colon
- Left-sided colitis: inflammation from the rectum up the left side of the colon
- Extensive colitis or pancolitis: inflammation of the whole colon, with more severe symptoms
Ulcerative Colitis vs. Crohn’s Disease
- Location: Ulcerative colitis affects only the colon and rectum. Crohn’s disease can affect any part of the digestive tract.
- Pattern: Ulcerative colitis is continuous. Crohn’s disease can leave healthy gaps between inflamed areas.
- Depth: Ulcerative colitis affects the inner lining. Crohn’s disease can affect the whole wall of the bowel.
- Bleeding: Bloody stools are more typical of ulcerative colitis.
Possible Complications
- Heavy bleeding and anemia
- Dehydration
- Toxic megacolon, a rare but serious swelling of the colon
- A hole in the colon (perforation)
- Bone loss
- Blood clots
- A higher risk of colon cancer after eight to ten years, mainly with extensive disease
- Complications outside the bowel, such as eye, joint, and liver problems
How Doctors Diagnose It
- Medical history and exam: Your doctor asks about your symptoms and family history.
- Blood tests: They check for anemia, infection, and inflammation markers such as CRP.
- Stool tests: They rule out infections and measure calprotectin, a marker of bowel inflammation.
- Colonoscopy or sigmoidoscopy: A doctor looks at the lining of your colon with a camera and takes tissue samples (biopsies). This is the main test.
- Imaging: Doctors may use an X-ray, CT scan, or MRI to check for complications.
Treatment of Ulcerative Colitis
There is no cure with medicine, but treatment can control symptoms and keep the disease in remission. The goal is to stop inflammation, heal the lining, and prevent flares.
Aminosalicylates (5-ASA)
Medicines such as mesalamine reduce inflammation in mild to moderate disease. They come as tablets, suppositories, and enemas.
Corticosteroids
Doctors use them for short periods to calm moderate to severe flare-ups. They are not suitable for long-term use because of side effects such as weight gain, bone loss, and high blood sugar.
Immunomodulators
Medicines such as azathioprine and 6-mercaptopurine lower the immune response. They take weeks to work.
Biologics and Targeted Medicines
- Anti-TNF drugs: infliximab and adalimumab
- Integrin blockers: vedolizumab
- Interleukin blockers: ustekinumab
- JAK inhibitors: tofacitinib and upadacitinib
These treat moderate to severe disease. Doctors screen for infections such as tuberculosis before they start them.
Surgery
Doctors may remove the colon in severe cases, when medicine fails, or when cancer risk is high. Removing the colon cures the disease in the bowel. Most people then have a pouch made from the small intestine, or an ileostomy.
Diet and Lifestyle Tips
No diet cures ulcerative colitis, but food choices can ease symptoms.
- Keep a food diary to find foods that trigger your symptoms.
- During flares, eat smaller meals more often, and choose soft, low-fiber foods such as rice, bananas, and cooked vegetables.
- In remission, eat a balanced diet with fruits, vegetables, whole grains, and lean protein.
- Drink plenty of fluids, especially when you have diarrhea.
- Limit alcohol, caffeine, and very fatty or spicy foods if they upset you.
- Ask your doctor about supplements, such as iron, vitamin D, and vitamin B12, if blood tests show a shortage.
- Manage stress with exercise, sleep, and relaxation.
- Do not smoke.
Colon Cancer Screening
People with ulcerative colitis have a higher risk of colon cancer after about eight to ten years. Your doctor will advise regular colonoscopies to check for early changes.
Living With Ulcerative Colitis
Most people live full lives with proper treatment. Take your medicines even when you feel well, keep your check-ups, and tell your doctor about any change. Support groups can help. Women with ulcerative colitis can usually have healthy pregnancies, and it is best to plan pregnancy when the disease is in remission.
When to Get Emergency Help
Go to the hospital right away if you have severe belly pain, heavy bleeding, a high fever, a very fast heartbeat, a swollen belly, or signs of dehydration, such as dizziness and very little urine.
Taking Your Medicines Well
- Take medicines at the same times every day, and use reminders.
- Do not stop medicines when you feel well. Remission often depends on them.
- Tell your doctor about all supplements and pain medicines you use. Avoid ibuprofen, diclofenac, and similar pain medicines unless your doctor allows them.
- Keep a symptom diary to share at appointments.
- Ask about blood tests, because some medicines need regular monitoring.
Ulcerative Colitis in Children and Older Adults
Children with ulcerative colitis may grow slowly or have delayed puberty, so a pediatric gastroenterologist should manage their care. Older adults may be more sensitive to medicine side effects and need extra care with infections and bone health.
Emotional Health and Ulcerative Colitis
Living with a long-term illness can cause stress, anxiety, and low mood. Embarrassment about urgent bowel movements can make people avoid social events. Talk to your doctor, a counselor, or a support group. Good mental health helps you manage the disease.
Questions to Ask Your Doctor
- How much of my colon is affected?
- Which medicine is best for me, and what side effects should I expect?
- How often should I have a colonoscopy?
- Do I need any vitamins or supplements?
- What should I do if I have a flare?
When to Call Your Doctor
Call your doctor if your symptoms return, if you see blood in your stool more often, or if you have a fever, weight loss, or new joint or eye pain. Early treatment prevents flares from becoming severe.
Frequently Asked Questions
Can ulcerative colitis be cured?
No medicine cures it, but surgery to remove the colon cures the disease in the bowel. Treatment keeps most people in remission.
Is ulcerative colitis hereditary?
Genes play a role, but most people with a relative who has IBD do not develop it.
Does stress cause ulcerative colitis?
Stress does not cause it, but it can trigger flares.
Can ulcerative colitis cause cancer?
It raises the risk of colon cancer over time, so regular colonoscopies matter.
Which foods should I avoid?
It varies. Keep a food diary and avoid the foods that trigger your symptoms.
Disclaimer: This article is for information only. It is not medical advice. Please talk to your doctor about your own health.