Hair Loss — Knowledge Base
Hair Structure — What It Looks Like on the Inside
Understanding what hair is actually made of helps make sense of why it grows or falls out in the first place.
Published: 23 August 2026 · Updated: 23 August 2026
Shaft and follicle — two different stories
The visible hair shaft is mostly the protein keratin. Everything else happens below the skin's surface — in the follicle, along with the bulb and the sebaceous gland. It's the follicle's condition, not the shaft, that decides whether and for how long a new hair grows.
A cycle that never really stops
Anagen (growth), catagen (transition), telogen (rest) — after the last phase, the hair sheds and the follicle starts producing another one. This happens continuously, independently in every single follicle.
What to discuss during a consultation
An article about “Hair Structure — What It Looks Like on the Inside” can help organise the subject, but the cause of a hair or scalp problem needs an individual assessment. Sudden or worsening hair loss, pain, itching or changes to the scalp should be discussed with a doctor or dermatologist.
Bring information about when the symptoms started, your health conditions, medicines and recent health changes. This helps clarify whether further tests are appropriate and what next steps may make sense.
The content on this page is for informational purposes only and does not constitute medical advice. Each case requires an individual consultation. Treatment results depend on patient characteristics and are not guaranteed.
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Questions & Answers
Frequently Asked Questions
Does all hair fall out at the same time?
No — hair follicles sit in different phases of the cycle independently of each other, which is why natural, everyday shedding of some hair is completely normal.