Syphilis stage 3 is not dangerous to life if actively treated without serious complications, and can live for years, decades, or even for a long time. Syphilis is a sexually transmitted disease (STD) caused by infection with the syphilis spirochete, which is mainly transmitted through sexual intercourse, mother-to-child transmission, and blood transmission. Syphilis is divided into one, two, three syphilis, one, two syphilis usually use penicillin treatment can be completely eradicated, syphilis three mainly violates the cardiovascular and cerebral blood vessels and nerves, resulting in cardiovascular and cerebral blood vessel damage, no drugs can be completely eradicated, drug treatment can alleviate the condition, prolong the life, and even life is not a danger, you can survive for a long time. Syphilis third stage need to actively seek medical treatment, through the formal and reasonable treatment, prolong life.