In which stage of hair growth is the hair actively growing?

The stage of hair growth in which hair is actively growing is the anagen phase. During this phase, hair follicles are in their most active state, and new cells are generated at the root of the hair shaft. This leads to the lengthening of the hair strand, which can last for several years, depending on various factors such as genetics and health.

In contrast, during the catagen phase, hair transitions from active growth and begins to shrink and detach from the blood supply, marking the end of the anagen phase. The telogen phase is a resting stage where the hair is not growing but remains attached until it enters the next cycle of growth. The term "dormant" is not a recognized stage in the hair growth cycle and may be misleading, as the correct phases are anagen, catagen, and telogen. Understanding the anagen phase as the active growth period is crucial for grasping the overall hair growth cycle and its implications for hair health and treatments.