Sweat hair suddenly becomes longer and more abundant, often related to the increase of androgens in the blood, may be due to polycystic ovary syndrome, hyperadrenocorticism and other reasons. 1. Polycystic Ovary Syndrome (PCOS): only seen in women, due to abnormal regulation of the hypothalamus-pituitary-ovary axis, the body secretes excessive luteinizing hormone, which stimulates the interstitial matrix of the ovaries to produce excessive androgens. In addition to the symptoms of hirsutism, the absence of ovulation may cause scanty menstruation, amenorrhea, often accompanied by acne, obesity and other manifestations. 2. Hyperadrenocorticism: in addition to the gonads, androgens can also come from the adrenal cortex. If the adrenal cortex secretes cortisol adenomas or malignant tumors, it can cause hyperadrenocorticism and secretion of more androgens, which can lead to the symptoms of hirsutism. In addition, patients can also secrete more glucocorticoids to cause Cushing’s syndrome, appearing centripetal obesity, full moon face, buffalo back and other manifestations. When the above symptoms occur, it is recommended to go to endocrinology and other related departments for a comprehensive assessment of the condition based on medical history, symptoms, signs and relevant test results, and it is recommended to follow the doctor’s instructions for active treatment to avoid aggravation of the condition and impact on life.