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While studying the pattern of hair loss, it is necessary to understand how hair grows and the entire sequence from hair growth to hair fall. Hair cycle consists of three phases:
Anagen Phase (Growth Phase): This phase varies from 2–6 years. At any time, approximately 85–90% of hair is in a growing phase and is believed to grow 10–15 cm per year.
Catagen Phase (Transitional Phase): This phase lasts around 1 or 2 weeks. During this phase, the dermal papilla that nourishes the follicle breaks away to rest and the hair follicle shrinks to about 1/6th of its normal size.
Telogen Phase (Resting Phase): This phase lasts around 5–6 weeks. At any time, approximately 10–15% of hair is in the resting phase. The hair stays attached to the follicle and does not grow.