[header] How to treat the mumps [title] Keep in mind mumps is contagious before symptoms occur. [step] The symptoms of mumps usually develop 14 to 25 days after the person is infected. Someone who is infected with mumps is most contagious about 3 days before the facial swelling becomes evident. 
[substeps] Be aware, in addition, that in about 1 in 3 cases, mumps doesn't cause any noticeable symptoms in the infected person. [title] Check for swelling of the salivary glands.