The common hazards of varicocele are as follows: 1. Patients with severe varicocele may experience discomfort and scrotal heaviness, especially after long periods of walking or standing, with more pronounced pain symptoms. Symptoms may alleviate when lying flat. If untreated, the pain will persist. 2. Varicocele may affect the blood return in the testicles, potentially raising testicular temperature, adversely affecting the survival and growth of sperm. This may result in abnormal semen quality, including anomalies in sperm count and quality, which in severe cases could lead to infertility.