The various conditions that cause infertility in males are
- Abnormal Semen: include Low Sperm Count, Decreased Sperm Mobility, Abnormal Sperm Morphology
- Damage to the testicles affects the quality of sperm leading to infertility. Infection, trauma, surgery, congenital defect, undescended testicles, cancer etc could lead to testicular damage
- Absence of Sperm in semen also known as obstructive azoospermia. This is primarily due to blockage in the tubes of the reproductive system due to infection, surgery or the like.
- Sterilization: a surgery involving the cutting and sealing of vas deferens. This is the tube that carries sperm from the testicles. As a result the semen contains no sperm
- Ejaculation problems including retrograde ejaculation in which sperm is ejaculated into the bladder or premature ejaculation in which ejaculation occurs too quickly.
- Hypogonadism: due to low levels of the male sex hormone, testosterone. This could be due to a chromosomal defect in which you are born with an extra female chromosome (Klinfelter’s Syndrome) or due to tumor or consumption of illegal drugs.
- Certain medications and drugs like those used in chemotherapy or in the treatment of Crohn’s Disease or Rheumatoid Arthritis or anabolic steroids may affect fertility. Exposure to radiation, tobacco smoke, alcohol, marijuana etc. may also impair sperm production.