According to WebMD, average hair loss for women and men consists of 50 to 100 strands per day. Washing the hair can cause a woman to lose up to 250 strands in a day.
Hair loss in women typically manifests in a part that grows wider over time or the visibility of more scalp than usual when pulling hair back in a ponytail. Women often see hair loss on the top half of the scalp, with the front hairline staying in place. Other signs of hair loss include strands of hair left on a pillow each morning or finding more hair than normal in a hairbrush or a comb.