The causes of frequent diarrhea in the elderly are mainly considered to be digestive tract tumors, ulcerative colitis, intestinal flora disorders, acute gastroenteritis and other diseases. 1. Tumor in digestive tract: Tumor growth in gastrointestinal tract, including benign intestinal polyps and malignant tumors such as gastric cancer, intestinal cancer, etc., which affects the digestive function of gastrointestinal tract and will easily cause frequent diarrhea. 2. Ulcerative colitis: ulcerative colitis with ulcerated surfaces in the intestine can also cause frequent diarrhea, and patients often have symptoms of mucous blood stools. 3. Indigestion: with age, the digestive function of the person begins to weaken, easy to cause frequent diarrhea. 4. Acute gastroenteritis: Eating cold, spicy food or catching cold can trigger acute gastroenteritis, which may lead to frequent diarrhea. Frequent diarrhea in the elderly may also be caused by intestinal flora disorders and other factors, pay attention to timely consultation for relevant examinations to determine the cause of treatment, to avoid delaying the condition.