See Your Medical Doctor When...
Your hair loss is rapid.
You experience hair loss after taking high doses of vitamins, such as vitamin A.
Your hair loss accompanies other problems, such as hypothyroidism or malnutrition.
You suspect that you or your child has alopecia areata, or that your child has trichotillomania; both conditions should be evaluated by a doctor.
You suffer an unexplained loss of hair on any part of your
body. Your doctor may want to check for an underlying disorder that might be responsible.