Orchitis is a complication of [[mumps]] infection occurring in males (who are beyond puberty). Symptoms begin 7-10 days after onset of mumps and include inflammation of the [[testicles]], [[headache]], [[nausea]], [[vomit]]ing, pain and [[fever]].
Most patients recover but in rare cases [[sterility]] occurs.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#o</ref>