What is the correct order of the hair growth cycle phases?

What is the correct order of the hair growth cycle phases?

• A. Anagen, Catagen, Telogen
• B. Catagen, Telogen, Anagen
• C. Telogen, Anagen, Catagen
• D. Anagen, Telogen, Catagen

Answer: (A)

The hair growth cycle follows a specific sequence: Anagen, Catagen, Telogen. Anagen is the active growth phase where cells in the follicle divide and the hair shaft lengthens. This stage lasts the longest, so most hairs are growing during this time. Catagen is a brief transitional period in which growth stops and the follicle shrinks, signaling the end of the active growth. Telogen is the resting phase; hair stays in the follicle for a while before eventually shedding and a new Anagen phase begins. This order—growth, transition, then rest—reflects how hair continually cycles, with each phase serving a distinct role in preparing for the next cycle. If the sequence started with Catagen or Telogen, there would be no preceding growth to form a hair shaft, which doesn’t align with how hair actually behaves.

The hair growth cycle follows a specific sequence: Anagen, Catagen, Telogen. Anagen is the active growth phase where cells in the follicle divide and the hair shaft lengthens. This stage lasts the longest, so most hairs are growing during this time. Catagen is a brief transitional period in which growth stops and the follicle shrinks, signaling the end of the active growth. Telogen is the resting phase; hair stays in the follicle for a while before eventually shedding and a new Anagen phase begins. This order—growth, transition, then rest—reflects how hair continually cycles, with each phase serving a distinct role in preparing for the next cycle. If the sequence started with Catagen or Telogen, there would be no preceding growth to form a hair shaft, which doesn’t align with how hair actually behaves.