People have between 100,000 and 150,000 hairs on their head. Most people normally shed 50 to 100 hairs a day.
The first sign of hair loss is typically noticing more hairs than usual left in the hairbrush after brushing or hair build up in the tub drain after shampooing. Styling can also show areas of thinning, where your part may be getting wider or your crown area seems thin.