The causes of weakness in defecation are as follows. First, consider that the patient himself is weak, suffering from chronic diseases or serious illnesses for a long time, and consumes more energy. If the abdominal pressure increases during defecation, the muscles need to consume more energy if they are tightened, and at this time the patient himself is in poor health. Second, consider that due to intestinal factors, if the patient has long-term constipation, the intestinal tract may be wider and more relaxed, and intestinal peristalsis has less effect on downward defecation. Then, consider that the gastrointestinal power is insufficient and the intestinal peristalsis is not ideal. In addition, consider the reason of the elderly, who are generally less fit and have less muscle strength. Therefore, the force of defecation is less, so there is a feeling of weakness in defecation. Finally, it is considered that the patient does not have much stool, but only inflammation of the intestine, so it will produce a feeling of downward movement, and the inability to pass stool during defecation will be mistaken for weakness of defecation.