Masturbation is a normal and healthy sexual activity enjoyed by a large low sperm count; infertility; mental illness; physical weakness.
Unlike sex with a partner, masturbation can't give you a sexually transmitted disease. Nor will it subject you to the muscle strains, pokes in the eye, and awkward.
I believe you want to know what diseases are caused due to masturbation. It causes many diseases and can be harmful for long term health.
Historically compulsive masturbation has been included in paraphilia related disorders, which also include protracted promiscuity, dependence.
Masturbation is a fun and normal act used by many to explore their body and feel pleasure. Despite the myths, there are no physically harmful.