Pelvic tuberculosis, i.e. tuberculous pelvic inflammatory disease, is caused by Mycobacterium tuberculosis infecting the pelvic organs through four ways: bloodstream transmission, direct spread, lymphatic transmission and sexual intercourse transmission. 1. Bloodstream transmission: it is the most important way of transmission. During puberty, the genital organs are developing and rich in blood, so Mycobacterium tuberculosis is easy to be transmitted through the bloodstream. When Mycobacterium tuberculosis infects the lungs, it will invade to the genital organs in a year or so, which will lead to tuberculosis pelvic inflammatory disease. 2. Direct spread: due to the neighboring location, when the peritoneum and intestines are infected with Mycobacterium tuberculosis, it can spread to the pelvis directly. 3. Lymphatic spread: If you have digestive tract tuberculosis, Mycobacterium tuberculosis can infect the pelvis through lymphatic vessels. 4. Sexual intercourse spread: If a man suffers from urinary tract tuberculosis, he may get infected through upstream infection during sexual intercourse, resulting in tuberculous pelvic inflammatory disease. If tuberculous pelvic inflammatory disease is found, it should be treated promptly under the guidance of a doctor to prevent complications.