Hair Loss Causes More Condition_symptoms Is It Genetic Or Stress That Causes Hair Loss?

Is it genetic or stress that causes hair loss? - hair loss causes more condition_symptoms

I am a normal 18-year-old son (turning 19 in 2 weeks) and instant messaging experience hair loss last 8 months. Each of my parents lost his hair when he older, but I think the problem of hair rather side with the mothers? Perhaps a bit stressed cuz of school and family issue. I can not do anything to prevent this?