hi doctor I am 18 years old. I used to masterbate on a daily basis until I started getting some discomfort in feet especially my toes, my testicles were also sensitive when I lightly tapped them. After a while I got really bad pain in my sides so I quit masterbating for a few days, when I masterbated after 5 days some of the symptoms came back like sensitive testicles and discomfort in toes.
Hello, Masturbation is usually safe, normal, natural and never unhealthy. But excessive and vigorous masturbation can be stressful for many of your body parts including penis skin and testicles.  You don't have to worry about the pain and sensitivity you are experiencing because that should cure itself within ten days or so. Please take rest from masturbation for around one month.  If pain persist you should consult a doctor. Therefore, I suggest consulting a urologist for physical examination, diagnosis and treatment. Hope I have answered your query. Let me know if I can assist you further. Take care