The most important thing is that you can feel a large hard lump in the rectum, which may be constipation or benign or malignant tumors of the rectum, as follows: 1. constipation, when the gastrointestinal dysfunction of the spleen and stomach to reduce the digestive function, gastrointestinal peristalsis slowed down, the accumulation of stool in the rectum will feel a large hard lump. It is usually accompanied by abdominal pain, bloating, acid reflux, belching, nausea, vomiting, loss of appetite, and the pain can disappear on its own after the bowel movement. 2, may be rectal tumors, including benign tumors and malignant tumors, benign tumors have a smooth surface and are movable, usually do not have a great impact on the body, and only produce pressure on the surrounding tissues and organs; malignant tumors grow fast and are accompanied by fever, loss of weight, weakness of limbs, 3. The benign and malignant tumors can not be diagnosed by simple palpation, but need to undergo proctoscopic examination to clarify the cause and then actively cooperate with the treatment.