All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
There is no verse or Hadeeth which determines such harms that are mentioned in the question and which may result from masturbation. However, masturbation is forbidden for the Sharee'ah evidence that we clarified in Fatwa 81150.
The fact that doctors confirm such harms even confirms the prohibition. That is because harming one’s own self and exposing it to what harms health is forbidden in Islam. Allaah Says (what means): {…and do not throw [yourselves] with your [own] hands into destruction}[Quran 2:195] Allaah also Says (what means): {And do not kill yourselves [or one another]. Indeed, Allaah is to you ever Merciful.} [Quran 4:29]
Moreover, ‘Ubaadah Ibn As-Saamit narrated that the Prophet decreed that there should be no harm nor reciprocal harm. [Ahmad and Ibn Maajah]
Allaah Knows best.