Bloating

Ulcerative colitis (UC), referred to as ulceration, is an unexplained rectal or colitis disease. It mainly involves the rectum, sigmoid colon, and descending colon. Its pathological features are mucosal congestion, edema, multiple superficial ulcers, thickening of the intestinal wall, narrowing of the intestinal cavity, and formation of polyps. Clinically, it is characterized by refractory diarrhea, mucus, blood or purulent stool, abdominal pain, and post-emergency, and can be accompanied by extraintestinal manifestations such as fever, anemia, arthritis, skin lesions, and liver disease. Very few acute onset, most of them have a slow onset, a long course, often recurrent, and often have a period of remission, also known as chronic non-specific ulcerative colitis. Early abdominal pain, diarrhea, and bloody stools may appear. Colonic muscle spasm, colon swelling, and inflammation stimulate local sensory nerves, causing varying degrees of abdominal pain. Abdominal distension is mostly limited to the left lower abdomen or lower abdomen, showing paroxysmal mild pain. Colic can appear when the lesion is severe.