Colitis is a gastrointestinal disorder that is characterized by inflammation of the large intestine (colon). This condition causes abdominal pain, diarrhoea, rectal bleeding, and other symptoms. The exact cause of colitis is not known but is believed to be due to an abnormal immune system response to bacteria or other irritants in the intestine. Treatment of colitis usually involves medication, dietary changes, and lifestyle modifications. The primary symptom of colitis is abdominal pain that may be accompanied by diarrhoea, rectal bleeding, and other symptoms. The pain can be severe and can range from mild to intense. Other symptoms may include decreased appetite, weight loss, fatigue, and fever. In some cases, bleeding from the rectum may occur. The diagnosis of colitis is typically made based on the patient's symptoms and a physical examination. Additional tests, such as blood tests, stool tests, and endoscopy, may be performed to confirm the diagnosis. Treatment of colitis typically involves medication, dietary changes, and lifestyle modifications. Medications may include anti-inflammatory drugs, antibiotics, and immunomodulators to reduce inflammation and improve symptoms. Diet modifications may include avoiding foods that can irritate the intestine, such as dairy, gluten, and processed foods.