Bumps inside the anus and pain when pressed may be caused by hemorrhoids, anal polyps, anal fistula and other causes. 1. hemorrhoids: the disease belongs to the rectum and the anal area of the veins are swollen, as if varicose veins, which can cause internal anal pimples, pain on pressure, but also can be accompanied by obvious itching, pain and other symptoms. 2. Anal polyp: usually occurs in the rectum or anal canal mucous membrane of the swelling, which may lead to anal internal lumps, pain on pressure, may also be accompanied by prolapse, blood in the stool, diarrhea, abdominal pain and other symptoms. 3. anal fistula: the disease is usually secondary to perianal abscess, due to the formation of anal fistula fistula, resulting in the formation of paranasal tissue and anal canal communication, in the area of the fistula, due to inflammation stimulation, may cause localized hard lumps, resulting in the anus inside the lumps, pain by pressure phenomenon. There are lumps inside the anus, pressure pain, may also be related to other factors, it is recommended to consult a doctor as soon as possible, through the improvement of relevant examinations, a clear diagnosis, to give targeted treatment.