[Male infertility: causes, diagnosis, and treatment].

Male infertility accounts for 20% of cases of infertility in couples. The causes can be congenital (hormonal disorders, genetic abnormalities) or acquired (varicocele, cancer, treatment, ejaculation disorders). The diagnosis is based on a thorough interview, a clinical examination, and a semen analysis. Treatment depends on the cause: correction of factors, medical or surgical treatment, or assisted reproductive technology. If these fail, sperm donation may be offered to the couple.