Oligospermia, a condition characterized by a low sperm count, can arise due to various underlying causes. One of the most common reasons for oligospermia in men is varicocele. Varicocele, characterized by the enlargement of veins within the scrotum, can negatively impact sperm production and quality. While some patients may show improvement after varicocele surgery, recovery is not always guaranteed; in rare cases, the condition may even worsen.

Other significant factors that can lead to oligospermia include:
* Infections: Reproductive system infections.
* Ejaculatory Disorders: Problems with ejaculation such as premature ejaculation, frequent ejaculation, or inability to ejaculate for extended periods.
* Undescended Testis: In infants with undescended testicles, if surgical correction is performed after the age of 2, the risk of oligospermia increases. Therefore, it is crucial for infants with undescended testicles to undergo surgery before the age of 2.
* Genetic and Systemic Causes: Chromosomal anomalies and certain systemic diseases like Celiac disease.
* Surgical History: Previous surgical operations such as hernia repairs.
* Environmental Exposure: Prolonged exposure to chemical substances such as paints, pesticides, and lead.
* Lifestyle Factors: Tobacco use, obesity, depression, and excessive alcohol consumption can also contribute to oligospermia.