Hair loss affects both genders, regardless of age.
Heredity, stress, hormonal changes, medication, skin conditions, infections, diets, use of products with chemicals, exposure to extreme natural conditions, pollution, polluted water are the causes of hair loss.
Also testosterone when found in abnormal high values is a cause because it affects growing in women too.
Also significant hair loss cause can be diabetes and cancer.
Hair dye, permanent, and improper bathing products can cause hair loss.
In women hair loss can be triggered by the pregnancy and menopause, but in men the most common cause is heredity.