During which phase does hair growth actively take place?

Hair growth actively takes place during the anagen phase of the hair growth cycle. This phase is characterized by the rapid division of hair follicle cells, producing new hair fibers, and leading to an increase in hair length. The anagen phase can vary in duration depending on the individual, typically lasting several years, and is crucial for the overall health and density of hair.

During this phase, the hair is firmly anchored in the follicle, receiving adequate nourishment from the dermal papilla, which is responsible for supplying blood and nutrients necessary for growth. Consequently, the anagen phase is vital for ensuring a robust and vibrant head of hair.

In contrast, the other phases such as telogen and catagen represent different stages in the hair growth cycle, where hair is either resting or transitioning, without actively growing. Telogen is a resting phase with minimal activity, while catagen is a transitional phase where hair growth slows down and the hair follicle shrinks. Telogen effluvium refers to a temporary condition leading to excessive hair shedding, often triggered by stress or hormonal changes, which also does not reflect active growth. Thus, understanding the distinction between these phases highlights the importance of the anagen phase in hair growth.