Hair Growth Process & Regrowing Hair

Everything You Need to Know About the Hair Growth Process & Regrowing Hair

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There’s far more to hair growth than many people realize. The hair growth process occurs in a cycle, with hair follicles going through four different stages as they grow, regress, rest and shed over the course of several years.
Understanding hair growth is an important part of learning more about why your hair thins and falls out. It’s also useful knowledge for regrowing your hair and helping you maintain as much hair as possible over time.
In this guide, we’ll explain the entire hair growth process, from the growing phase right through to shedding and regrowing hair. We’ll also explain how understanding the hair growth process can help you combat and reverse the effects of hair loss.

The Four Stages of Hair Growth

The hair growth process (or hair growth cycle, as it’s often referred to in medical literature) has four different stages:

• The anagen, or growing phase, during which your hair grows.
• The catagen, or regression phase, during which your hair follicles shrink and detach from your skin.
• The telogen, or resting phase, during which new hair begins to grow under the older, detached hairs.
• The exogen, or shedding phase, during which the older hair falls out from your scalp and is replaced by the new hair.

Each of these stages lasts for a different amount of time, meaning your hair can grow for years before it enters into the catagen, telogen and exogen phases. Below, we’ve explained each hair growth phase in more detail to help you better understand the hair growth process.

The Anagen (Growing) Phase

During the anagen phase, your hair is actively and continuously growing. This phase of the hair growth process usually lasts for three to five years, although some people have anagen phases of up to seven years.
Because your hair is continuously growing during the anagen phase, the length of this phase of the hair growth cycle determines the maximum length of your hair. For most people, this is 18 to 30 inches.

The Catagen (Regression/Transition) Phase

After each hair follicle completes its anagen phase, it enters the catagen, or regression phase. A hair follicle in the catagen phase will shrink slightly in size and detach from your skin, starting its process of falling out.
Although hair in this phase "detaches" from your skin, it usually doesn’t fall out until much later, usually when the new hair “pushes” it out from your scalp.

The Telogen (Resting) Phase

After a hair follicle enters the catagen phase and detaches from your scalp, it enters a resting period known as the telogen phase. This phase usually lasts for three to five months before a hair is "pushed" out by the growth of new hair.
Most people have about 10 to 20% of their hair in the telogen phase at any time. Sometimes, when a person is stressed or physically unwell, other health conditions can cause more hair follicles than normal to enter the telogen phase, resulting in temporary hair shedding.

The Exogen (Shedding) Phase

Once the new hair has grown, the old hair enters the exogen phase. During this phase, the old hair completely detaches from the scalp and falls out, usually while you’re using a comb, brush or washing your hair in the shower.
It’s normal for about 50 to 150 hairs to go into this phase and fall out on a daily basis, meaning there’s no need to panic if you notice a few hairs on your comb or brush after styling your hair.
As the new hair grows, it replaces the old hair and completes the hair growth cycle, giving you replacement hairs for all of the hairs lost during the catagen, telogen and exogen phases of the growth process.