The causes of infertility can be seen in male genitourinary tract infections, elevated scrotal temperature in men, and testicular diseases. 1. Genitourinary tract infections: excessive leukocyte products, such as reactive oxygen species can directly damage the sperm membrane; reproductive tract infections can cause obstruction of the vas deferens tract, manifested by the absence of sperm in the semen. Such as epididymitis, seminal vesiculitis and so on. 2. Elevated scrotal temperature: such as varicocele can cause localized elevated temperature of scrotum, and insufficient sperm activity affects the reproductive function; in addition, varicocele may also increase venous pressure, leading to insufficient testicular perfusion, reflux of toxic substances of renal origin and other causes of infertility. 3. Testicular diseases: for example, if testicular torsion is not treated in time, the blood vessels of the spermatic cord are blocked due to torsion, tissue necrosis occurs in testicular ischemia, and testicular atrophy leads to semen abnormality and infertility. Infertility can also be caused by other reasons, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination and treatment with the help of the doctor.