Four or five bowel movements a day can be caused by bowel disease such as enteritis or bowel cancer, or by gastritis, gastrointestinal dysfunction or medication. Under normal circumstances, the number of bowel movements per day is usually no more than three. When bowel function is affected, it is possible that the number of bowel movements may be affected. Stools four or five times a day may be caused by bowel diseases such as enteritis and bowel cancer, or by gastritis, stomach cancer and gastric ulcers. Medicines such as lactulose can increase the number of bowel movements. Taking cold food, eating too much or taking too many vegetables and fruits may also cause four or five bowel movements a day. So once you have bowel movements four or five times a day, you need to go to the hospital for further blood tests, stool tests, gastroscopy, colonoscopy and other tests to find out the cause.