Some people don't worry much about bad hair days because they've lost most of it. Illness and certain drugs cause baldness. So does chemotherapy for cancer patients. But heredity causes 95 percent of baldness. Men are much more likely then women to go bald.
Many men lose most or all of the hair on the top of the head.
This is called male-pattern baldness. A man can inherit the tendency to be bald from either parent. For hundreds of years, men have tried to find a remedy for baldness. Hippocrates, the Greek physician regarded as the father of medicine, rubbed pigeon droppings on his head. Cleopatra mixed together a hair-restorer for Julius Caesar made with ground horse teeth, deer marrow, charred mice and bear grease.