Лето - сезон наибольшего выпадения волос у женщин

Ф Phenomenon of seasonal shedding has garnered attention, yet its underlying mechanisms remain poorly understood. Research suggests that fluctuations in seasons may temporarily impede or cease hair growth, resulting in a noticeable increase in shedding shortly thereafter.

A seminal study involving 823 women discovered that hair shedding reaches its peak during the summer months, with a secondary, albeit less pronounced, surge observed in spring. Conversely, winter appears to be associated with minimal shedding.

More recent findings based on Google search data from eight English-speaking countries indicate that summer and autumn are correlated with increased searches for the term "hair loss." This suggests that individuals may experience hair loss during these seasons.

Theories concerning evolutionary advantages of seasonal hair loss have been proposed.

"From an anthropological perspective, it is believed that having thicker hair in winter provided protection against cold temperatures," says Dr. Lupo. "For new hair growth to occur, existing hair must be shed." This process is integral to the hair growth cycle.

The Hair Growth Cycle

Dr. Hirsch notes that the hair growth cycle comprises a series of phases, including normal shedding.

The hair growth cycle can be broken down into four distinct stages:

• Anagen This active growth phase, lasting two to eight years, is characterized by hair emerging from the follicle.
• Catagen This transitional phase, spanning two to three weeks, marks a decrease in hair growth and follicular shrinkage.
• Telogen In this resting phase, which can last up to three months, hair ceases growing but remains attached to the scalp.
• Exogen Hair is actively shed from the scalp during this phase, allowing for new hair growth to commence.

Other Contributing Factors to Hair Loss

Beyond seasonal shedding, several other factors can lead to increased hair loss:

• Telogen Effluvium This temporary form of hair loss is triggered by stressors such as illness, surgery, or nutrient deficiencies. It typically manifests a few months after the initial event.
• Anagen Effluvium This condition, often associated with chemotherapy but also linked to radiation and toxin exposure, results in rapid hair loss that may regrow within a few months.
• Alopecia Areata This autoimmune disease causes the immune system to attack hair follicles, resulting in patches of hair loss.
• Androgenetic Alopecia Also known as female pattern hair loss, this is the most prevalent type of permanent hair loss in women. Hair thinning at the crown or widening of the part line are characteristic symptoms.
• Nutritional Deficiencies A diet lacking essential vitamins and minerals can have a detrimental impact on hair health.
• Hormonal Changes Shifts in estrogen levels due to pregnancy or thyroid disorders can disrupt the hair growth cycle, leading to increased shedding a few months later.