Hi welcome to Healthcaremagic
Hi Brother, there are no side effects of masturbation
..., but rare side effect is phimosis
due to fibrosis
of the skin of penis... you can avoid by stop watching porn movies, pictures., obscene videos.. concentrate on studies, divert the mind to sport, game play... other activities.. spirituality may also be helpful reading word of God will stop you by doing it..
Hope I have answered your question..