hårcykeln

Hårcykeln, often translated as the "hair cycle," refers to the natural growth phases that hair undergoes on the human scalp and body. This cyclical process ensures continuous hair renewal. The cycle is divided into three main phases: anagen, catagen, and telogen.

The anagen phase is the active growth period, during which hair follicles are actively producing new hair shafts. This phase can last for several years, with the duration varying depending on the location of the hair on the body and individual genetics. Most of the hair on a person's head is typically in the anagen phase.

Following the anagen phase is the catagen phase, a short transitional period that lasts about two to three weeks. During catagen, hair growth stops, and the follicle begins to shrink and detach from its blood supply.

The final phase is the telogen phase, also known as the resting phase. This phase lasts for approximately two to four months. During telogen, the hair remains in the follicle, but it is no longer growing. Eventually, the old hair will be shed, and a new hair will begin to grow from the follicle, starting the anagen phase anew. The length of each phase and the total number of hairs in each phase contribute to the overall density and appearance of hair. Disruptions to this natural cycle can lead to conditions such as hair thinning or loss.