Hair loss questions

Hair loss caused by stress mostly occurs in patches.

Can neglecting partial hair loss lead to overall hair loss progression?

For example, if hair loss occurs on the crown due to stress or dieting and is left untreated without visiting a hospital

I'm wondering if it could progress to overall hair loss.

Even if causes like stress or dieting disappear, recovery does not happen automatically; in such cases, it is essential to visit the hospital.

I wonder if I need to go and receive treatment.

How long should hair loss persist before you should visit a hospital?