Almost 50% infertility cases are due to male problems.These problems are caused by sperm disorders, either very less in quantity or inadequate in quality.

Causes

Making mature, healthy sperm that can travel depends on many things. Problems can stop cells from growing into sperm. Problems can keep the sperm from reaching the egg. Even the temperature of the scrotum may affect fertility. These are the main causes of male infertility:

Sperm Disorders

• Varicoceles
• Retrograde Ejaculation
• Immunonologic Infertility
• Obstruction
• Hormones
• Medication
• Sperm Disorders

The most common problems are with making and growing sperm. Sperm may:

• not grow fully
• be oddly shaped
• not move the right way
• be made in very low numbers (oligospermia)
• not be made at all (azoospermia)

Sperm problems can be from traits you’re born with. Lifestyle choices can lower sperm numbers. Smoking, drinking alcohol, and taking certain medications can lower sperm numbers. Other causes of low sperm numbers include long-term sickness (such as kidney failure), childhood infections (such as mumps), and chromosome or hormone problems (such as low testosterone).

Damage to the reproductive system can cause low or no sperm. About 4 out of every 10 men with total lack of sperm (azoospermia) have an obstruction (blockage) within the tubes the sperm travel through. A birth defect or a problem such as an infection can cause a blockage.