If the stomach does not hurt but diarrhea occurs, it is mainly seen in: 1. Intestinal diseases, diarrhea is the most common, mainly due to intestinal viral infections, indigestion, gastrointestinal tract dysfunction, and intestinal flora dysbiosis caused by inflammatory exudation in the intestine, abnormal intestinal peristalsis and the role of intestinal pathogenic bacteria, resulting in increased water in the intestine, so the stool is thin stool, due to the inflammation of the intestine stimulation The symptoms of abdominal pain are not obvious because the inflammation is less stimulating to the intestine. In addition, intestinal tumors, intestinal tuberculosis and other diseases can also lead to painless diarrhea. 2, systemic diseases, such as hyperthyroidism, mainly due to the increase in thyroid hormones leading to an increase in the systemic basal metabolic rate, intestinal peristalsis will also be accelerated, the water in the intestine can not be fully absorbed by the intestine, resulting in loose stools, while not accompanied by abdominal pain.