Understanding How Hair Grows

February 20, 2026 | By HSW Clinic

Hair_grows

Understanding How Hair Grows

Hair growth consists of three phases: anagen, catagen, and telogen.

Anagen Phase – The Growth Stage

The anagen phase marks the active growth period of a hair follicle. During this phase, cells in the hair bulb divide, contributing to the elongation of the hair strand. The length of the anagen phase varies individually, with scalp hairs remaining in this growth stage for several years. The duration of this phase plays a crucial role in determining the length of your hair.

Catagen Phase – The Transitional Stage

The catagen phase represents a transitional period where the hair follicle undergoes regression. This relatively short phase serves as a bridge between the active growth of anagen and the resting phase of telogen.

Telogen Phase – The Resting Stage

The telogen stage represents the resting period within the hair growth cycle. In this phase, the hair follicle remains inactive, and the current hair naturally falls out, creating space for the emergence of new hair. Typically, about 10–15% of our hair is in the telogen phase concurrently. External factors such as stress, illness, or hormonal changes can influence the duration of this phase.

The Role of Hair Phases in Hair Transplants

Understanding the natural hair growth cycle is fundamental for grasping the dynamics of a successful hair transplant. Surgeons carefully consider the existing hair phases when planning and executing a transplant procedure. Transplanting hair follicles during the anagen phase, when they are actively growing, ensures a higher likelihood of successful graft survival and long-term results.

How does the hair growth cycle affect transplant success?

Transplanting hair follicles during the anagen phase increases the chances of successful integration into the recipient area.

Can hair transplants change the natural hair growth cycle?

A hair transplant primarily redistributes existing hair follicles; it does not alter the intrinsic growth cycle. Transplanted hairs will continue to follow their natural growth pattern.

Understanding the nuances of hair phases is a crucial step for individuals considering a hair transplant. The knowledge of the anagen, catagen, and telogen phases provides insight into the intricate world of hair growth cycles, empowering individuals to make informed decisions about their hair restoration journey.

If you’re exploring the possibilities of a hair transplant, consult with a qualified professional who can guide you through the process, taking into account the unique characteristics of your hair and its natural growth phases.

Reviewed by Dr. Andre Nel
One of the world’s leading hair transplant surgeons based in Dublin.

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