Increased stool frequency in ulcerative colitis is caused by ulcerative colitis leading to inflammatory lesions in the intestinal tract, digestive tract dysfunction and so on. Ulcerative colitis is a chronic non-specific intestinal inflammation of unknown cause, with common clinical manifestations such as increased stool frequency and abdominal pain. Increased stool frequency is due to the intestinal mucosa stimulated by inflammation, intestinal peristalsis, intestinal digestion and absorption dysfunction, too late to digest the food and absorb the water in the food, these failed to absorb the material will be excreted. The number of stools in ulcerative colitis is also related to the severity of the disease. Patients who go to the hospital to confirm the diagnosis of the disease should actively cooperate with the doctor’s treatment, follow the doctor’s instructions to use mesalazine, prednisone, infliximab, salazosulfapyridine, etc., to control the disease and relieve symptoms.