What are the problems caused by excessive masturbation and how to overcome those problems?

Short term: loss of time that can be used in productive work or social activities in a successful pursuit of life. Long term: potential for performance failure when the opportunity for natural partner sex is available along with other mental health issues. Occasional sex, whether solo or partner based does not hurt the body. Solution: moderation

Addiction /habit forming- like any thing which gives intense pleasure- drugs sweets tasty food which can lead to ultimately needing more- in a vicious cycle. Best is to find a diversion to use the time in social service, hobby, exercise or anything worthwhile- of your choice- You can do it. good luck