<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor I am 13 ,I was masturbating like three times week for 2 months last year but i have preiceved from its danger so i stopped it and i did workouts ... I stopped workouts for 5 months and after about 4 months of that , i have masturbated only one time then i was having a PE subject after that day .. i have run and suddenly i feel pain in my knees when i run .. is that from that once masturbating or stopping doing work out... and i masturbate now twice a week and i have planned to stop it but the problem i feel pain in my lower back and when i bend over my lower back tremble a little , what is that from Doctor??  <response>: Degree understand your concerns went through your details. Masturbation is natural and normally considered healthy and a stress buster if done in moderation. At your age, masturbation marks sexual maturity. Please do not relate the masturbation habit and physical problems. Such a relation should result in unnecessary worries and anxiety. Your knee pain is not related to your masturbation. In my opinion, you can safely masturbate 4 times a week. Your perceived information is totally wrong and baseless. If you require more of my help in this aspect, please use this URL. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. 