It is a condition that affects sperm production (i.e. spermatogenesis), making it very difficult for these males to father children naturally. An affected man may produce:
- No sperm cells (azoospermia)
- A smaller-than-usual number of sperm cells (oligospermia)
- Abnormally shaped sperm cells (teratospermia)
- Sperm cells that do not move properly (asthenozoospermia)
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