Ulcerative colitis with two to three bowel movements per day is mild in the active phase. Ulcerative colitis is an inflammatory lesion of the rectum and colon of unknown cause that involves the mucosa and submucosa. Depending on whether the disease is in an active phase, it can be divided into active and remission phases, and the active phase can be divided into mild moderate and severe based on the number of diarrhea, anemia, fever, blood in stool, blood sedimentation, and other symptoms and indicators. In the active phase, mild refers to diarrhea less than 4 times a day without fever and anemia, etc. Severe refers to diarrhea more than 6 times a day with fever and anemia, accelerated blood sedimentation and other symptoms, and those in between are called moderate. For the acute attack of this kind of disease, you should be hospitalized, and the medicine can be applied according to the doctor’s instructions, such as salicylazosulfapyridine, mesalazine, and so on, and if necessary, you can also choose the surgical treatment.