Medical conditions include alopecia areata (al-o-PEE-she-uh ar-e-A-tuh), which causes patchy hair loss, scalp infections such as ringworm and a hair-pulling disorder called trichotillomania (trik-o-til-o-MAY-nee-uh).
https://www.mayoclinic.org/diseases-conditions/hair-loss/symptoms-causes/syc-20372926

