A cyst in the head of the left epididymis does not usually affect fertility. However, if surgical treatment is taken, there is a risk of damaging the epididymal ducts, which may affect fertility. A cyst of the head of the left epididymis does not usually affect a man’s fertility. The epididymis is divided into three parts: the head, the body and the tail. The head is formed by many epididymal tubules, while the left epididymal head cyst is a cystic change caused by obstruction of a part of the epididymal duct, and many other epididymal ducts are not affected, so it does not affect fertility. A left epididymal head cyst is a benign lesion. It is the presence of a cystic mass in the epididymis and the mass is located in the left head of the epididymis. When surgical treatment is taken, there is a risk that the surgery will destroy the epididymal ducts and may affect fertility. When cysts appear in the head of the left epididymis, patients should go to regular hospitals in time, and take targeted treatment measures under the guidance of professional doctors, in order to strive for early recovery and minimize complications.