The most common symptoms of mumps include fever, headache, muscle aches, tiredness, and loss of appetite followed by onset of parotitis (swollen and tender salivary glands under the ears -- on one or both sides).
Mumps can lead to hearing loss and aseptic meningitis (an infection of the covering of the brain and spinal cord) in about 10% of cases. Painful, swollen testicles occur in 20% to 30% of males who have reached puberty (orchitis) -- but rarely does this lead to fertility problems. About 30% of women who have reached puberty can have painful swollen breasts (mastitis) from mumps and, in a very few cases, inflammation of the ovaries.
If it takes just one sperm and one egg to create a baby, why must men make so many sperm? And how many sperm are considered normal? How long do sperm live? Can they survive outside the body? Do men stop making sperm as they age? Is there anything you can do to increase sperm production or improve the health of your sperm?
WebMD takes a look at the facts about sperm and answers these and other frequently asked questions.