Why does hair fall out?

Our experts answer your most frequently asked questions.

Hair emerges from hair follicles, at around 100,000 to 150,000 on every head. The hair life cycle includes three phases:

1. The anagen phase: this is the growth phase. It lasts for 3 to 6 years. Hair grows.
2. The catagen phase: this is the resting phase. Hair stops growing. This lasts for 3 weeks.
3. The telogen phase: the falling out phase. The hair falls out and is replaced by a new hair in the anagen phase. This lasts 3 months.