A lump of flesh in the anus may be caused by hemorrhoids, rectal prolapse, rectal polyps and other diseases. 1. hemorrhoids: hemorrhoids can be divided into internal hemorrhoids, external hemorrhoids, mixed hemorrhoids, etc., when suffering from hemorrhoidal diseases, dry stools, habitual constipation, abdominal pressure increases, etc., will make the mucous membrane localized oedema, breakage, bleeding, and other symptoms, and even out of the anus, the phenomenon of the anus with a piece of meat. 2. Rectal prolapse: when the rectal mucosa relaxation, anal sphincter relaxation, the rectum occurs partially, completely prolapse, in the anus can be seen in the protruding mass of meat, mostly in middle-aged and elderly women. 3. Rectal polyps: Because the rectum is close to the anus, polyps in the rectal area occur at the end of the rectum, in the hard stool, it will be easy to appear in the anus with lumps of meat symptoms. If you have lumps of meat in your anus, you should go to the anorectal department of the hospital in time, and after clarifying the cause of the disease, you should be given correct and reasonable treatment under the guidance of the doctor.