Hair Loss in Men
The most common type of male hair loss, which is responsible for 85-90% of temporary and permanent hair thinning and baldness, is a condition known as Androgenetic Alopecia .
The Three Stages Of Hair Growth
Anagen Stage: This is the most important phase in the hair’s growth cycle. It is the growing or active phase and varies for each individual, lasting from 2–6 years, with hair growing about 1/4–1/2 inch per month. Hair regrowth continues as long as the dermal papilla (the group of cells directly below the hair follicle) supplies the glucose needed for energy and produces the amino acids required for new hair growth. Each hair follicle cycles 10–20 times in a lifetime.
Catagen Stage: This is the regressive or resting period when there is no active hair growth. During this stage, the hair follicle begins to degenerate. This stage lasts 1–2 weeks.
Telogen Stage: During this phase, which lasts 5–6 weeks, capillaries supplying essential growth elements to the hair follicle become inactive, causing the hair to be shed. As new hair begins to grow and replace it, the hair follicle re-enters the anagen phase.
Other causes of Alopecia
Vascular Alopecia: Blood supplies the nutrients and oxygen essential for metabolizing hair cells. If this supply is compromised, the hair follicle does not receive the nutrients and energy it needs for proper hair growth.
Nutritional Deficiencies: Excessive hair loss is often observed in individuals who are malnourished or affected by sudden weight loss, bulimia, or anorexia. Deficiencies in zinc and iron may also contribute to thinning hair.
Medications: The use of over-the-counter and prescription drugs, as well as the misuse of vitamins, is one of the most overlooked causes of hair loss.
Medical Problems: Excessive hair loss is associated with several diseases and medical disorders. In some cases, it may be the only symptom of low thyroid function (hypothyroidism).