What kind of treatment is available for hair loss?

My hair is gradually falling out, and I'm losing weight through exercise.

Why is this hair falling out...

What types of hair loss treatments are available?

All I know is just hair transplantation? Prescriptions for hair loss medication? That's about it. I'm not sure if the procedure includes hair loss medication prescriptions or shampoos, or if I need to find out separately.

I used to go around casually, but now I'm thinking about getting a tattoo. Does this also count as a procedure?