What can cause a man to be infertile?

Male infertility can be caused by a variety of factors, including hormonal imbalances, genetic conditions, medical issues such as Diabetes or infections, and anatomical problems like varicocele. Lifestyle factors such as obesity, smoking, excessive alcohol consumption, and drug use can also negatively impact fertility. Additionally, environmental factors, like exposure to certain chemicals or radiation, may contribute to infertility. Age can play a role as well, with sperm quality generally declining as men get older.