Everyone loses hair. It is normal to lose about 50-150 hairs every day. If you see bald patches or lots of thinning, you may be experiencing hair loss. There are many reasons for hair loss. When hair loss begins suddenly, the cause may be due to illness, diet, medicine, or childbirth. If hair loss is gradual and becomes more noticeable with each passing year, a person may have hereditary hair loss. Certain hair care practices also can cause noticeable hair loss. Luckily, most causes of hair loss can be stopped or treated. Anyone troubled by hair loss should see a dermatologist.