The normal size of the transverse diameter of the prostate is around 4cm, and the transverse diameter of the prostate of 3.8cm is normal. Prostate transverse diameter 3.8 cm, is the size of the adult prostate, under normal circumstances, the male prostate in about 25 years of age to complete the development, and to the age of 50 years old, there may be prostate enlargement, this is a normal physiological situation, do not need to worry too much. When the prostate gland has inflammatory diseases or prostate hyperplasia diseases, it may cause pathological enlargement of the transverse diameter of the prostate, and the patient may also experience symptoms such as frequent urination, urgency, painful urination and difficulty in urination, which affects the patient’s quality of life. Some men due to testicular hypoplasia or testicular deficiency can lead to a decrease in the secretion of sex hormones, causing atrophy of the prostate gland, which may lead to a decrease in the transverse diameter of the prostate and other conditions. When the patient’s prostate gland body appears prostate transverse diameter, volume abnormalities, etc., it is recommended that timely medical treatment, usually pay attention to avoid eating spicy and stimulating food, can not drink alcohol, avoid sedentary and prolonged cycling and so on.