Hair grows in several cycles, which consist of:
• A long growing phase (anagen)
• A short growing phase (catagen)
• A resting phase (exogen)
When the resting phase ends, the hair falls, allowing new hair follicles to grow in the new cycle.
In general, about 40 hairs (up to 78 in men) reach the exogen phase every day. In other words, you can expect up to 78 hairs to fall if you are a man.
If this number exceeds 100 hairs per day, it becomes pathological, and medical care is necessary.