Hair on a woman’s chest may be a normal physiological phenomenon, but also consider the hormone metabolic abnormalities, polycystic ovary syndrome, Cushing’s syndrome and so on. 1. Normal phenomenon: the chest is covered with hair follicles, and when the local hair follicles develop, the phenomenon of hair on the chest can occur. If it is not accompanied by pain, redness, swelling and other uncomfortable symptoms, it is usually a normal situation, no need to worry too much. 2. Abnormal hormone metabolism in the body: When a woman recently consumes a lot of hormone-containing food, stays up late for a long time, suffers from mental stress, or takes hormone drugs, etc., it can cause abnormal hormone metabolism in the body, which can be manifested as hairy chest, or even exuberant hair phenomenon. 3. Polycystic ovary syndrome: the cause of the disease is still unclear, may be related to genetic and environmental factors. Typical symptoms of patients are menstrual disorders, hirsutism, acne, etc., so it can be manifested as hairy chest. 4. Cushing’s syndrome: mainly due to the hypothalamus-pituitary-adrenal axis mismatch, prompting the adrenal cortex to secrete a large amount of glucocorticoids, which often causes patients to appear centripetal obesity, muscle atrophy, hirsutism, sexual dysfunction and other symptoms, can also be manifested as hair on the chest. Therefore, we should consult a doctor in time to clarify whether it is caused by pathological factors.