There is a small hard lump inside the anus which is painful when pressed, and normal bowel movement may be due to hemorrhoids, perianal abscess and rectal cancer. 1. Hemorrhoids: hemorrhoids in the early stage usually do not appear obvious symptoms, some patients may appear anal itching, anal pain, bleeding and prolapse, when the symptoms are serious, it will lead to hard lumps in the anal area, accompanied by pain when pressed. 2. Perianal abscess: Perianal abscess can also cause small hard lumps in the anal area, accompanied by pain on pressure. Some patients may have persistent pain and swelling, and may have fever when the symptoms are serious. 3. Rectal cancer: rectal cancer is a kind of malignant tumor of rectum which is more common in clinic. When rectal cancer occurs in the lower part of rectum, when the lump is serious, there may be small hard lump inside the anus and the symptom of pressing pain may occur, and some patients may also have the symptoms of constipation, diarrhea alternately and bleeding from anus and so on. A small hard lump inside the anus may be caused by anal fissure, anal cancer, etc. It is suggested that patients should go to the hospital in time for checkup, and give treatment as soon as possible to avoid delaying the condition.