What triggers hair loss in October and November - scientists' explanation## Formatting note: I've maintained the original text structure while translating from Russian to English as requested.

Hair loss usually intensifies in autumn. While normally a person loses about 100 hairs per day, in October-November this number increases noticeably. As explained by Valery Litvinov, a candidate of medical sciences, the reason lies in the reduction of daylight hours, hormonal changes, and the consequences of summer stress, as reported by "Gazeta.Ru".

According to the specialist, during summer with longer daylight hours, serotonin and vitamin D that stimulate hair growth are synthesized more actively. In autumn, their levels decrease, and the pineal gland begins to produce melatonin more intensively. This hormone transitions some hair follicles into a resting phase, and after 2-3 months, the process of increased hair loss begins.

"Therefore, the peak of seasonal hair loss occurs in October-November, although it starts in August-September. This is a natural renewal, not a cause for concern," Litvinov emphasized.

External factors also have an additional influence. Summer heat, excess ultraviolet radiation, and emotional stress become stressors for the body, and autumn hair loss is often a delayed reaction. Excessive sun exposure causes oxidative stress to the scalp and damages follicle cells.

It's not difficult to distinguish between physiological and pathological hair loss. The norm is a slight increase in hair on the comb or after washing your head. Concern should be raised by hair falling out in clumps, the appearance of bald spots, or a noticeable decrease in hair density - in such cases, you should consult a doctor.

The scientist also noted that seasonal hair loss has evolutionary origins. In animals, molting helped adapt to changing seasons, and this mechanism has been preserved in humans as a rudiment.

To reduce losses, Litvinov advises maintaining a balanced diet, avoiding stress, and properly caring for your hair. Cosmetic procedures, such as mesotherapy, can help with existing problems with hair density, however, in most cases, autumn hair loss does not require intervention.