The anagen phase, also known as the growth phase, initiates the hair growth cycle. In this stage, hair undergoes active growth as hair follicle cells proliferate, increasing length. This phase spans 2–7 years, contingent upon genetics and body location. At any given moment, roughly 85–90% of scalp hairs are engaged in this phase. Prolonged anagen duration correlates with increased hair length.
Analogy: Consider a seedling actively absorbing nutrients, thereby facilitating sustained upward development.