It’s normal to shed about 100 hairs each day as old hairs are replaced by new onesBut some women have hair loss—called alopecia (AL-uh-PEE-shuh). Hair loss can happen for many reasons:

• Female-pattern baldness causes hair tothin, but rarely leads to total baldness. It tends to run in families. 
• Alopecia areata (AR-ee-AYT-uh) is an autoimmune disease that causes patchy hair loss on the scalp, face, or other areas of your body. l Hormone changes during and after pregnancy.
• Underlying health problems, such as polycystic ovary syndrome (PCOS) or thyroid disease.
• Certain medicines, such as birth con-trol pills or those to treat cancer, ar-thritis, depression, or heart problems.
• Extreme stress, such as from a major illness. 
• Hairstyles that twist or pull hair.

Whether or not hair will grow back depends on the cause of hair loss. Some medicines can help speed up the growth of new hair. If hair loss is permanent, you can try hair weaving or changing your hairstyle. Or talk with your doctor about other options, such as a hair transplant.