Although masturbation is a normal process and it does not harm you in anyway, excess masturbation may cause anxiety, testicular injury and sometimes testicular torsion, an emergency surgical condition, after vigorous masturbation. Sometimes vigorous manipulation of penis as in masturbation causes mechanical injury to testes leading to testicular pain. Excess of anything is wrong. Testes are normally loose. It is not due to masturbation. Advice 1. Avoid excess masturbation and if you practice it, manipulate your penis gently 2. Tablet ibuprofen 400 mg orally when pain is unbearable. Otherwise avoid it. 3. Wear loose undergarment and avoid tight jeans 4. Involve yourself in creative activities, read good books and focus yourself on study and your career I hope this information will help you. I will be happy if you ask another question Thanks