An anal abscess is an infected cavity filled with pus found near the anus or rectum. Ninety percent of abscesses are the result of an acute infection in the internal glands of the anus. Occasionally, bacteria, fecal material or foreign matter can clog an anal gland and tunnel into the tissue around the anus or rectum, where it may then collect in a cavity called an abscess. An anal fistula also commonly called fistula-in-ano is frequently the result of a previous or current anal abscess.

A patient who feels ill and complains of chills, fever and pain in the rectum or anus could be suffering from an anal abscess or fistula. These medical terms describe common ailments about which many people know little. What is an anal abscess? An anal abscess is an infected cavity filled with pus found near the anus or rectum. What is an anal fistula?

What is a perianal abscess? A perianal abscess is an infection in a mucous-secreting gland in the anal canal around your anus. What is a perianal fistula?

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