There are many reasons for androgen reduction, such as ageing, pituitary tumor, idiopathic hypogonadotropic hypogonadism, etc., which may lead to androgen reduction, which can be supplemented with medicines such as testosterone undecanoate, testosterone valerate, etc., or surgical treatment. 1. Ageing: testosterone level may gradually decrease after 30 years old, which is a normal physiological phenomenon. 2. Pituitary tumor: this disease will affect the normal hormone secretion function, resulting in a decrease in sex hormone secretion. Patients can seek timely medical treatment for surgical treatment, and with testosterone undecanoate, testosterone valerate and other drugs for treatment. 3. Idiopathic hypogonadotropic hypogonadotropic hypogonadism: patients can be treated with drugs such as testosterone undecanoate or gonadotropin-releasing hormone pulse therapy. The cause of androgen reduction may also be related to genetic factors, other testicular diseases, and poor lifestyle habits. For specific treatment options, it is recommended to follow the doctor’s advice.