An injury or disease to the testicles can reduce their function and so impact upon fertility. For example, a blow received playing sport or as a result of a fight.
This can affect the blood supply to the testicles which damages the ability produce sperm.
Viral infections such as orchitis (painful swelling of the testicles) can also mean a failure to produce sperm.
Surgery can be carried out to treat any of these but it is not a guarantee of fertility.
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