Understanding the Phases of the Hair Growth Cycle
01 / 09 / 20

Understanding the Phases of the Hair Growth Cycle

At HRC – Hair Restoration of California, we know a full, fabulous healthy head of hair is important to nearly everyone. Understanding the phases of hair growth can be the first step in finding the answers you seek regarding your hair loss or thinning hair. We’ve compiled the facts and data you need to understand the natural phases of hair growth, so we can help you find the solution to restore your hair. Let’s learn about hair and the natural growth cycle.

The Beginning of Hair

Hair, as you know, plays a crucial role in human appearance, but hair is also scientifically complex. While still in utero, a developing human baby has all its hair follicles (5 million or so) by week 22, a million of which are on the head. Humans don’t ever grow new hair follicles, so these numbers represent the highest number of hair follicles any of us will ever have. The density of follicles changes during growth cycles as our scalps expand. Hair is unique and consists of a follicle (in your skin) and a shaft (the visible part). The follicle extends to the dermis where tiny blood vessels nourish the cells. Two sheaths protect the hair shaft, allowing it to grow. The hair shaft has three layers and is made of keratin (a protein).

The Natural Hair Growth Cycle

In most mammals hair growth and shedding is seasonal, but not so in humans, where the hair growth cycle is more random. Essentially hair grows around 0.35 mm per day, up to six inches or so per year. During the year, hairs will be growing or shedding, though not all at the same time. The cycles of hair growth are, scientifically known as anagen, catagen, and telogen.

  • Anagen – The Active Phase – The root cells divide at a rapid pace as new hair is formed and pushes its way up and out of the follicle. The hair grows one centimeter a month and can grow faster in summer, staying in the anagen (active) phase up to six years which means a full grown hair can be anywhere from 18 to 30 inches long. The growth phase is different for everyone with some having a short growth phase and others having a long growth phase.
  • Catagen – The Transitional Phase – Approximately three percent of your hairs are in catagen at a given time. Catagen last no more than three weeks at which time growth stops.
  • Telogen – The Resting Phase – Telogen accounts for up to eight percent of hair on the scalp and lasts for approximately 100 days. During the resting phase, between 25 and 1000 hairs are shed while the hair follicle is at rest.

Every hair follicle on your head is independent, experiencing its own growth cycle at various times, so you don’t shed all your hair at once. Most hair loss and hair thinning issues arise from a disruption of your hair growth cycle which can be caused by hormonal imbalances, autoimmune disorders, illness, or poor nutrition. Medication and medical treatments can also cause hair loss and thinning and disrupt the hair growth phase. How you care for your hair can also have a negative effect if you are experiencing hair loss or loss or thinning.

Hair Loss and Hair Thinning Solutions Await You at HRC – Hair Restoration of California

At HRC – Hair Restoration of California, we want you to understand the phases of hair growth as well as the disruptors which can cause hair thinning and loss. We know that together, we can find the solution you seek and restore you to the thick, full, healthy head of hair your desire. We offer proven, effective, hair growth and restoration options with customized solutions designed just for you. Call us today at HRC – Hair Restoration of California, and take the first step by scheduling your free consultation.