Fact: 2/3 of men will experience hair loss by 35. There are a lot of causes for hair loss and we recommend reading the entire list of hair loss causes here if you're not sure what's causing your own.
One of the most common causes of hair loss is male pattern baldness (also known as androgenetic alopecia).
The best way to figure out if and why you personally are losing hair is to to speak to a doctor. If you want to make life easy (and you should), you can complete a consultation here and a licensed Keeps physician will quickly evaluate your case and provide a detailed consultation plan.