The process of hair growth is more intricate than it might appear at first glance. Our hair grows, rests, and sheds through a well-defined cycle composed of four distinct phases: Anagen, Catagen, Telogen, and Exogen. Understanding these phases can help you better manage your hair care routine and address any hair growth concerns.
1. Anagen: The Growing Phase
The Anagen phase, also known as the “growth phase,” is the most active and longest stage of the hair growth cycle. During this phase, hair follicles are actively producing new hair cells, resulting in continuous hair growth. On average, hair grows about half an inch per month during this stage, which can last from 3 to 5 years for most people, and even up to 7 years for some, particularly those of Asian descent. This prolonged phase allows hair to potentially reach lengths of up to 3 feet.
Approximately 90% of the hair on your scalp is in the Anagen phase at any given time. Ensuring good nutrition and a healthy lifestyle can help maintain this phase, promoting robust hair growth.
2. Catagen: The Transition Phase
Following the Anagen phase, hair enters the Catagen phase, a brief transitional period that lasts about 10 days. During this stage, hair growth slows, and the hair follicle begins to shrink. The hair detaches from the blood supply and the cells that produce new hair, signalling the end of active growth. Despite this detachment, the hair remains in the follicle for a short period.
Only about 3-5% of your hair is in the Catagen phase at any given time. This phase is critical as it marks the transition from active growth to rest.
3. Telogen: The Resting Phase
The Telogen phase is a resting period that typically lasts around 3 months. During this time, hair does not grow but remains in the follicle. New hairs begin to form in follicles that have recently shed hairs. This phase includes about 10-15% of your hair.
Some experts also refer to this stage as a part of the shedding process. The Telogen phase is a crucial period for new hair formation, setting the stage for the next cycle of growth.
4. Exogen: The Shedding Phase
The Exogen phase, often considered an extension of the Telogen phase, is when hair is actively shed from the scalp. It is normal to lose between 50 to 100 hairs daily during this phase. This stage can last from 2 to 5 months, during which new hairs are growing in the follicles, preparing to replace the shed hair.
The Exogen phase ensures the renewal of hair and the continuation of the growth cycle. Proper hair care during this phase, including gentle handling and avoiding harsh treatments, can minimize unnecessary hair loss.
Maintaining Hair Health Through All Stages
Healthy hair growth depends on various factors, including genetics, hormonal levels, and lifestyle choices. Here are some strategies to support hair health throughout the hair growth cycle:
Nutrition
Since hair is primarily composed of protein, maintaining a diet rich in healthy proteins is essential. Include lean meats, fish, beans, legumes, and low-fat dairy products in your meals. Vitamins and minerals such as Vitamin D, Vitamin C, iron, zinc, folic acid, and vitamin B12 are also crucial for hair health.
Stress Reduction
High stress levels can disrupt the hair growth cycle, leading to conditions such as Telogen effluvium, where stress pushes hair into the resting and shedding phases prematurely. Managing stress through yoga, meditation, breathing techniques, and counselling can help maintain a balanced hair growth cycle.
Proper Hair Care
Choosing the right shampoo and conditioner for your hair type is vital. Avoid harsh chemicals and excessive heat from styling tools. Be gentle with your hair, especially when it is wet, to prevent breakage. Use lukewarm water for washing and gently towel-dry your hair.
Understanding the four stages of hair growth—Anagen, Catagen, Telogen, and Exogen—can help you better manage your hair care routine and address any issues related to hair growth. A healthy lifestyle, balanced nutrition, stress management, and gentle hair care practices are essential for maintaining robust and healthy hair. If you experience unusual hair loss, consulting a healthcare professional can help identify any underlying conditions and provide appropriate treatments.
