How common is male infertility, and what are its causes?

CAUSES OF INERTILITY IN MALES

- Sperm abnormalities:
⁃ Due to low sperm counts, poor sperm quality or both and avcount for more than 90% of male infertility case. Its cause is unknon in30-40% of cases.
⁃ Low sperm count ( oligospermia:If the woman is fertile and young , a sperm count as 10 million /ml can bring acount conception over time at the rate of about 30% .
⁃ poor sperm motility (Asthenospermia) : Slow or zig-zig movement of sperm may have difficulty invading the cervical mucosao or penetrating the zona pellucida of the egg.
⁃ Abnormal sperm morphology ( teratospermia):Morphologically abnormal sperm cannot fertilize an egg.
⁃ extremely small ( pinpoint) head.
⁃ tapered head
⁃ crooked head
⁃ two heads
⁃ tail with kinks and curls
⁃ Low semen levels: below 2.5-5ml in one ejaculation.

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