Keep a close eye on your hair brush or comb. How often do you have to clean the hair from it? How much hair is on it when you have finished brushing/combing? This is the best clue about hair loss since the loose hairs are picked up by your brush or comb. If you are experiencing significant hair loss (cleaning your brush or comb more than once a week), the next time you go to the doctor clean your brush/comb and put the hair in a small plastic bag. Take it with you and talk to your doctor about the amount of hair and ask them if it is a normal amount to lose in one week. Some doctors will prescribe medications to slow down hair loss and/or regrow hair, but these medications are expensive and NOT covered by most insurances. I wish you luck and hope this answer helps.

Thinning hair, retreating hair. Seeing hair in shower, etc...

Becoming bald.

Hair on your pillow.

balding or losing your hair a lot of it

Firstly you will not necesarily notice hair loss on your comb or brush or even in the shower as the body naturally looses around 150 hairs per day.The first signs of male pattern baldness is a reduction of the hairline on the temples (receding hairline),followed by a thining on the crown ,these two patches will then normally meet until the whole of the dome of the head is bald.This pattern is due to there being very little flesh on the skull to hold the hair follicles(roots). Dont panic,either of these stages can happen very slowly,this is just the pattern it takes,there is no time line.For instance my hair started receding when I was 30ish,my crown has lost very little and I still retain at least 80% of my hair and I'm now 65.On the other extreme I have known clients that have lost the whole pattern within a period of ten years.. There are propriatery medicines to halt the spread,these will not bring back hair that is lost,they do work if you start early enough...but can be rather expensive. You can help the matter by keeping your hair and scalp well nourished and styling it with the direction of hair growth (usually straight forward) so as not to put stress on the follicles.