How to differentiate between hair loss caused by stress or hair loss caused by genetics? any specific hair loss patterns specific to different causes?

The amount of loss: Stress induced hair loss occur in clumps and diffuse--ie. many hairs fall out at once on your comb, in the shower, on your pillow, etc. When your body is under stress, it signals your hairs to fall out. That transition takes around 3-4 months. Stress induced hair loss today is in response to an event that occurred 3-4mos ago. Androgentic hair loss is gradual usually start on vertex and temples