What would make you lose hair,stress or illness?

they both can

Both

Also having a baby

Your hair sheds and falls out in clumps when you have a baby cause your hormones are all messed up and out of whack and trying to switch back over to being not pregnant.

Both including birth control.

u lose more hair when u r older

Both. Having a baby makes you lose the most hair

Both. Stress and illness both cause nutrient deficiencies.

Either; both.

Both things you mentioned are capable of leading to hair loss.

Stress will make you lose hair. Illness may cause hair loss, depending on the illness