How hair grows, and what that means for your routine

2026-10-29 21:26:18 · 6 min read

Hair grows in cycles from follicles in the scalp. Understanding the cycle explains why results take months and why gentle handling matters.

Hair is made in the scalp, not at the ends

Each hair grows from a follicle in the scalp. The visible strand is mostly a protein called keratin, arranged in a cuticle (outer layer), cortex (middle) and sometimes a medulla. The part of the hair you can see is no longer living tissue, which is why damage to the lengths cannot be "healed" — it can only be managed until it is cut away.

The growth cycle

Hair follicles move through three main phases:

• Anagen (growth): the active growth phase, lasting several years for scalp hair.
• Catagen (transition): a short phase where growth stops.
• Telogen (rest): the follicle rests for a few months before the hair is shed and a new one begins to grow.

Most people shed some hairs every day simply because those follicles have reached the end of telogen. Seeing hairs in the drain is usually part of this cycle, not a sign that something is wrong.

Why routines take months to show

Because growth happens slowly — roughly a centimetre a month for many people — any change you make to your routine shows up in the new hair near the roots, not in the ends. Judge a new routine after about three months of consistent use, not after two washes.

What actually helps the lengths

• Reduce friction: use a wide-tooth comb, avoid tight styles that pull, and pat hair dry rather than rubbing.
• Keep the scalp comfortable: a healthy scalp environment supports normal growth.
• Protect from heat: use the lowest effective temperature and avoid repeated passes.
• Be realistic: products can improve how hair looks and feels; they cannot change the growth cycle on their own.

What this app does and does not do

HairCare Companion helps you build a consistent routine and understand common concerns. It does not diagnose medical conditions, and it does not promise hair regrowth. If you notice sudden or patchy loss, scalp pain, or significant inflammation, see a qualified clinician.

Sources

• American Academy of Dermatology — Hair care and hair loss guidance (public patient information)
• NHS — Hair loss overview (public patient information)