The causes of low testosterone in women include physiological reasons, ovarian lesions, adrenal diseases, etc. It is recommended to consult a doctor. 1. Physiological reasons: during the menopausal transition, the decline of ovarian function can make the ovarian secretion function decline, which can lead to a decrease in testosterone secretion, which is a normal physiological phenomenon. 2. Ovarian lesions: when the ovaries are removed surgically or combined with ovarian cancer and chemotherapy, the ovarian function will disappear or decline, which will also cause a decrease in testosterone secretion. 3. Adrenal disease: when the adrenal cortex function is reduced, the hormones secreted by the adrenal cortex will be reduced, among which testosterone may also be reduced. When a woman has low testosterone, she needs to identify the cause under the guidance of her doctor and treat it actively.