The causes of pain under the belly button and dry and hard stools include physiological factors, gastrointestinal dysfunction, intestinal tumors and so on. 1. Physiological factors: lack of dietary fiber in the diet, low water intake, lack of exercise, etc., leading to poor stool discharge. The water in the stool is absorbed in the intestines, and there will be symptoms such as dry and hard stools, pain under the navel and so on. It is recommended that patients should have regular bowel movements every day, eat more vegetables and fruits, and exercise moderately. 2. Gastrointestinal dysfunction: For example, gastrointestinal dysfunction caused by dietary factors and psychological factors can lead to constipation, causing pain under the navel, dry and hard stools and other symptoms. Oral probiotics, such as bifidobacteria, lactobacillus, bacillus subtilis, etc. should be taken according to the condition. 3. Intestinal tumor: When suffering from intestinal tumor, the tumor spreads in the intestines, which leads to the obstruction of stool discharge and may lead to constipation. Patients feel pain under the navel, dry and hard stools, etc., which may be accompanied by blood in stool, emaciation and other symptoms. Surgery is the preferred treatment for this disease in the early stage, and chemotherapy can be assisted according to the condition. If there is pain under the navel for a long time, dry and hard stools, should go to the hospital, clear cause, for the cause of the treatment, such as dry and hard stools, obvious, poor discharge, can be given to the Keseru and other drugs to assist in defecation.