Types of Ulcerative Colitis
Understanding Ulcerative Colitis
Ulcerative Colitis Symptoms
Ulcerative Colitis Causes and Risk Factors
Ulcerative Colitis Diagnosis
Ulcerative Colitis Treatment
Difference between Ulcerative Colitis and Crohn’s Disease
How does a person get colitis?
Possible Complications of Colitis: All You Need to Know Ulcerative Colitis Complications
Prevention Tips
Conclusion
Frequently Asked Questions

What is Ulcerative Colitis (UC)?

Gastroenterology

Published Date: 05-07-2024 Updated Date: 12-10-2026

Written by Medicover Team

Medically reviewed by Dr Srinivas Nistala, Chief. Consultant lnterventional Gastroenterologist & Hepatologist

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Colitis means inflammation of the colon, or large intestine. It can happen for different reasons, and ulcerative colitis is one of the better-known types.

Ulcerative colitis (UC) is a long-term inflammatory bowel disease that affects the colon and rectum. It can cause frequent loose stools, blood or mucus in the stool, stomach cramps, and a strong urge to use the bathroom. Symptoms may become worse during a flare and then settle down for a while. With the right treatment and regular follow-up, many people are able to keep the condition under control.

Types of Ulcerative Colitis

Doctors classify ulcerative colitis based on how much of the large intestine is affected.

Ulcerative Proctitis: This type affects only the rectum. Rectal bleeding, an urgent need to pass stool, and a feeling that you have not completely emptied your bowel are common symptoms.
Proctosigmoiditis: Inflammation affects the rectum and the sigmoid colon, the lower part of the large intestine. A person may have bloody diarrhea, cramps, and frequent bowel movements.
Left-Sided Colitis: Inflammation extends from the rectum through the left side of the colon. Symptoms may include diarrhea, blood in the stool, abdominal discomfort, tiredness, and weight loss.
Pancolitis: Pancolitis affects most or all of the colon. Symptoms can be more troublesome and may include frequent diarrhea, bleeding, abdominal pain, tiredness, fever, and weight loss.

In rare cases, ulcerative colitis can become very severe and may require hospital treatment.

Understanding Ulcerative Colitis

Ulcerative colitis causes ongoing inflammation in the inner lining of the colon and rectum. The exact reason why it develops is still not completely understood.

Researchers believe that several things may be involved, including a person’s genes, the immune system, the gut microbiome, and environmental factors. It is not caused by one particular food or simply by stress.

UC is a chronic condition. This means symptoms may improve for some time and then return during a flare. Treatment helps settle active inflammation and keep the disease in remission.

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Ulcerative Colitis Symptoms

Ulcerative colitis does not look exactly the same in everyone. Some people have mild symptoms, while others may have more severe problems.

Common symptoms include:

Frequent or loose stools
Blood or mucus in the stool
Abdominal cramps or pain
A sudden or frequent urge to pass stool
Feeling that you still need to pass stool after using the bathroom
Tiredness or weakness
Reduced appetite
Unexplained weight loss
Fever during a more severe flare
Anemia, particularly when there is ongoing blood loss

If diarrhea or rectal bleeding continues, it is better to get checked rather than assuming it is a temporary stomach problem.

Ulcerative Colitis Causes and Risk Factors

There is no single cause of ulcerative colitis. It is thought to develop through a combination of genetic, immune, and environmental factors.

Abnormal Immune Response: The immune system appears to become overactive or respond abnormally in the digestive tract. This can lead to ongoing inflammation in the colon.
Family History: People who have a close family member with ulcerative colitis or another inflammatory bowel disease may have a higher risk. However, having a family history does not mean that a person will definitely develop UC.
Gut Microbiome: The intestine contains a large community of bacteria and other microorganisms. Changes in this gut microbiome may be linked to inflammatory bowel disease, although researchers are still working to understand the exact relationship.
Other Factors: Age, family history, genetics, and environmental influences may affect the risk. These factors can increase the likelihood of developing UC, but they do not by themselves confirm that someone will develop the disease.

Ulcerative Colitis Diagnosis

Diagnosing ulcerative colitis usually involves more than one test. Your doctor will consider your symptoms, medical history, examination findings, and test results.

Blood Tests: Blood tests can look for anemia, inflammation, infection, and other changes that may provide useful clues.
Stool Tests: Stool tests can help check for infections and signs of inflammation. Doctors may also test for Clostridioides difficile because this infection can cause symptoms that look similar to a UC flare.
Colonoscopy and Sigmoidoscopy: A colonoscopy allows the doctor to look closely at the lining of the colon and rectum. A flexible sigmoidoscopy examines the rectum and the lower part of the colon. During these procedures, small tissue samples called biopsies may be collected. Looking at these samples under a microscope can help confirm the diagnosis and rule out other conditions.
Imaging Tests: Depending on the symptoms and suspected complications, the doctor may recommend imaging tests. These are not needed for every person with suspected UC.

Ulcerative Colitis Treatment

Treatment is chosen based on how active the disease is, how much of the colon is affected, previous treatments, and the person’s overall health.

The aim is more than simply stopping diarrhea or bleeding. Doctors try to control the underlying inflammation, maintain remission, reduce the chance of future flares, and prevent complications. Current guidelines emphasize achieving and maintaining remission without long-term steroid use whenever possible.

Medicines

Different medicines may be used depending on the severity of ulcerative colitis.

5-ASA medicines: These are commonly used for mild to moderate UC.
Corticosteroids: These may be prescribed for a flare, but they are generally not used as a long-term maintenance treatment.
Immunomodulators: These may be suitable for some people as part of long-term disease management.
Biologic medicines: These target specific parts of the immune system and may be used when the disease is moderate to severe.
Other targeted medicines: Newer treatments, including certain small-molecule medicines, may be considered for moderate to severe UC.

The best medicine depends on the individual patient. Medicines should not be started, stopped, or changed without speaking with the treating doctor.

Diet and Lifestyle

Food does not cause ulcerative colitis, and there is no single diet that works for everyone with UC.

Some foods may make symptoms worse during a flare, while the same foods may be well tolerated when the disease is under control. Eating a balanced diet, drinking enough fluids, and making sure you get enough nutrients are important.

If certain foods repeatedly cause problems, a doctor or dietitian can help you work out what changes may be useful.

Surgery

Surgery may be considered when medicines are not controlling the disease or when serious complications occur.

In some cases, surgery involves removing the colon and rectum. The type of surgery depends on the person’s health, the extent of the disease, and other individual factors.

Difference between Ulcerative Colitis and Crohn’s Disease

Both ulcerative colitis and Crohn’s disease are inflammatory bowel diseases, but they are not the same condition.

Ulcerative Colitis	Crohn’s Disease
Mainly affects the colon and rectum	Can affect any part of the digestive tract
Usually begins in the rectum	May occur in different parts of the digestive tract
Inflammation is usually continuous	Inflammation can occur in separate areas
Mainly affects the inner lining of the bowel	Can affect deeper layers of the bowel wall
Blood in the stool is common	Blood may occur, but it is less typical

Doctors use symptoms, tests, endoscopy, biopsies, and other findings to tell the two conditions apart.

How does a person get colitis?

“Colitis” is a general term. It simply means that the colon is inflamed. Different types of colitis can have very different causes.

Ulcerative colitis: A chronic inflammatory bowel disease.
Crohn’s colitis: Crohn’s disease that affects the colon.
Infectious colitis: Caused by certain bacteria, viruses, or parasites.
Ischemic colitis: Happens when the blood supply to part of the colon is reduced.
Radiation colitis: Can occur after radiation treatment involving the abdomen or pelvis.
Microscopic colitis: Includes conditions such as collagenous colitis and lymphocytic colitis.
Diversion colitis: May develop in a section of the colon that is no longer exposed to the normal passage of stool.

Because the causes are different, treatment also varies.

Possible Complications of Colitis: All You Need to Know Ulcerative Colitis Complications

Many people with ulcerative colitis manage the condition well with treatment. However, poorly controlled or severe inflammation can sometimes lead to complications.

Severe Bleeding: Inflammation can cause bleeding from the colon. Heavy or ongoing bleeding can lead to anemia and may require urgent medical care.
Dehydration: Frequent diarrhea can cause the body to lose water and important electrolytes. Severe dehydration may need treatment with intravenous fluids.
Anemia: Blood loss and inflammation can both contribute to anemia. This may leave a person feeling unusually tired, weak, dizzy, or short of breath.
Toxic Megacolon: This is a rare but serious complication in which the colon becomes severely swollen and stops working normally. It needs urgent medical treatment.
Perforation: Severe inflammation can weaken the bowel wall and, rarely, cause a hole in the colon. This is a medical emergency.
Colorectal Cancer: People who have had ulcerative colitis for many years, particularly when a larger portion of the colon is affected, may have an increased risk of colorectal cancer. Doctors may recommend regular surveillance based on the person’s individual risk.
Problems Outside the Digestive System: UC can sometimes affect parts of the body outside the digestive tract. Joint pain, certain skin problems, eye inflammation, and liver or bile-duct problems can occur in some people with IBD.

Prevention Tips

There is no guaranteed way to prevent ulcerative colitis because its exact cause is still unknown.

If you already have UC, you can reduce the risk of problems by:

Taking your medicines as prescribed
Attending regular follow-up appointments
Telling your doctor when symptoms return or become worse
Eating a balanced diet
Drinking enough fluids
Avoiding unnecessary changes to your treatment
Following your doctor’s advice about colorectal cancer screening
Getting medical help quickly if you develop heavy bleeding, severe abdominal pain, high fever, or rapidly worsening symptoms

Regular monitoring is important because symptoms alone do not always show how much inflammation is present. Doctors may use tests such as fecal calprotectin, blood markers, and endoscopy to monitor the disease.

Conclusion

Ulcerative colitis is a long-term condition that causes inflammation in the colon and rectum. Diarrhea, blood in the stool, abdominal cramps, and bowel urgency are some of its common symptoms.

Although UC cannot currently be cured with medicines, it can be treated and managed. The right treatment can control inflammation, reduce flare-ups, and help people maintain their normal daily activities.

If you have ongoing diarrhea, rectal bleeding, unexplained weight loss, or repeated abdominal pain, speak with a doctor rather than trying to manage the symptoms on your own.

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Frequently Asked Questions

1. What is ulcerative colitis?

Ulcerative colitis is a long-term inflammatory bowel disease that affects the colon and rectum.

2. What are the main symptoms of ulcerative colitis?

Diarrhea, blood or mucus in the stool, abdominal cramps, bowel urgency, and tiredness are common symptoms.

3. What causes ulcerative colitis?

There is no single known cause. Genetics, immune-system changes, the gut microbiome, and environmental factors may all play a role.

4. Can ulcerative colitis be cured?

No medicine currently cures UC, but treatment can control inflammation and help maintain remission.

5. Can ulcerative colitis cause blood in the stool?

Yes. Rectal bleeding or blood mixed with stool is a common symptom.

6. How is ulcerative colitis diagnosed?

Doctors may use blood tests, stool tests, colonoscopy or sigmoidoscopy, and biopsies to make the diagnosis.

7. What foods should people with ulcerative colitis avoid?

There is no single food list that applies to everyone. Certain foods may worsen symptoms in some people, especially during a flare.

8. Is ulcerative colitis the same as Crohn’s disease?

No. Both are inflammatory bowel diseases, but they affect the digestive tract differently.

9. Can ulcerative colitis cause anemia?

Yes. Ongoing bleeding and inflammation can contribute to anemia.

10. Does ulcerative colitis increase the risk of colon cancer?

Yes. The risk can increase with longer disease duration and greater colon involvement, which is why surveillance may be recommended.

11. When should I see a doctor?

See a doctor for persistent diarrhea, blood in the stool, repeated abdominal pain, or unexplained weight loss. Heavy bleeding or severe abdominal pain needs urgent medical attention.