What is the cause of low sperm?

Oligospermia may be caused by a variety of factors, including reproductive system infections, iatrogenic factors, environmental factors, age, varicocele, endocrine factors, immune factors, chromosomal abnormalities and nutritional deficiencies. 2. Iatrogenic factors such as the use of hormone drugs, radiotherapy and chemotherapy or surgery, etc., may damage male sexual function.3. Environmental factors Environmental pollution and long-term work in a high temperature environment may lead to a decrease in male sperm quality.4. With age, male sexual function will naturally decline, and may also lead to oligospermia. 5. Varicocele is a disease that may affect male fertility. It can damage testicular health and affect sperm quality, resulting in oligospermia. 6. Endocrine factors such as thalamo-pituitary-testicular axis dysfunction can also affect testicular spermatogenesis. 7. Immune factors such as autoimmune disorders may also lead to oligospermia. 8. Chromosomal abnormalities such as Y chromosome deletion or chromosomal structural abnormalities may also affect semen quality.9. Nutrient deficiency Insufficient intake of nutrients, such as protein, vitamins, etc., may also lead to neurological disorders, thus affecting sperm production.