The size of normal male prostate is 40mmX30mmX20mm, if the size of the prostate reaches 47mmX41mmX37mm suggesting that the prostate is larger in size, it is not normal, indicating that it may suffer from prostatitis, prostate hyperplasia, prostate cancer and other diseases. 1. Prostatitis: because of bacterial and other pathogenic infections caused by inflammation of the prostate, inflammation can make the prostate gland congestion and edema, metabolites can not be eliminated to block the prostate gland ducts, which can cause the prostate gland to increase in size, and can be accompanied by urination pain, urinary urgency and urinary frequency and other symptoms. 2. Prostatic hyperplasia: it is a kind of disease that causes urinary difficulty in the elderly, the specific cause is not completely clear, it may be due to the imbalance between cell proliferation and apoptosis, the dynamic balance of the prostate extracellular matrix and growth factors is out of balance and other factors caused by the enlargement of the prostate, and it can cause frequent urination and urinary urgency, urinary incontinence and other symptoms. 3. Prostate cancer: it is cancer caused by malignant transformation of prostate epithelial cells. There may be no obvious symptoms in the early stage, but when the tumor causes enlargement and swelling of the prostate gland, there will be symptoms such as difficulty in urination, pain during urination and pressure pain in the rectum. When the examination finds that the size of the prostate exceeds the normal size, further examination should be carried out and treatment should be carried out under the guidance of the doctor.