What causes hair loss in female underarm (axillary) hair?

1. Natural shedding: Like other body hair, underarm hair goes through growth, regression, and resting phases, and natural shedding is a normal phenomenon. 2. Hormonal changes: Women may experience underarm hair loss due to hormonal fluctuations during physiological stages such as menstruation, pregnancy, or menopause. 3. Illness or medical treatment: Certain conditions such as hypothyroidism, malnutrition, or specific medical treatments and medications may also lead to underarm hair loss. 4. Physical damage: Frequent use of depilatory creams, razors, or other forms of physical trauma can also cause underarm hair to fall out.