The Catagen Phase is a short transitional stage in the hair growth cycle, lasting approximately 2 to 3 weeks. During this phase, hair growth slows as the follicle begins to shrink and separate from the dermal papilla, which supplies nutrients and signals for growth.

Although the catagen phase is brief, it is a vital part of the hair cycle, as it marks the end of active growth and prepares the follicle for the resting phase. Approximately 1% of hair follicles are in the catagen phase at any given time.

During this stage, the lower part of the hair follicle regresses, and the hair shaft becomes detached but remains in place until it is naturally shed in the telogen phase. This process ensures a smooth transition between growth and rest.

While the catagen phase is not typically a focus for treatments, understanding its role in the hair cycle is essential for developing comprehensive approaches to managing hair loss and promoting healthy regrowth.