Why It Hurts When Someone Pulls Our Hair But Not When We Go For A Haircut ??

Dear Ria,

 Hair is made up of proteins, which are dead cells but they are attached to the scalp with living cells, from where they grow. So, while getting a haircut a person does not feel pain because dead cells are being cut. Hair endings attached to scalp has nerve endings, so when hair is pulled it  puts pressure on the nerve endings that are at the root of the follicle.Hence , it pains when hair is pulled.