What could caurse blockage of sperm pass?

Blockage of sperm passage can be caused by several factors, including congenital abnormalities, infections, or surgeries that lead to scarring in the reproductive tract. Conditions such as epididymitis or vasectomy can also obstruct the flow of sperm. Additionally, tumors or inflammation in the reproductive organs may contribute to blockages. These issues can prevent sperm from reaching the ejaculate, impacting fertility.