Is there a way to determine whether I have hair loss or not?

Since I was young, I have had many gray hairs and white hairs, so I have been dyeing my hair.

I have been dyeing my hair almost once a month for nearly 20 years.

There was a time when scalp care was nonexistent, and my scalp was red all year round.

These days, I have given up on my appearance and am just leaving my gray hair as it is without dyeing it.

My hair is too fluffy, so I am getting a down perm.

As a result, I am a bit worried about hair loss.

I'm curious about how everyone observes areas that cannot be seen by oneself.