Thank you for asking. I can understand your concern. Masturbation as such may not be harmful. But if it done for wrong purpose like for relaxing, to avoid stress, to be able to sleep, or if done with use of pornography, in such cases it can become problematic and addictive. Not able to control masturbating, irritability, poor concentration, weakness, etc these are symptoms of Compulsive masturbation problem. Also pornography use while Masturbation is an important cause for Erectile Dysfunction.