The non-suppurative form is usually due to gonorrhœal infection, and as a rule is bilateral.
Arthritis of the temporo-mandibular joint occurs in two forms, non-suppurative and suppurative.
non-suppurative disease of the middle ear may be acute or chronic.
Of the non-suppurative varieties the most common is the epidemic form known as mumps.
The prognosis is better in the case of post-suppurative conditions than in the non-suppurative ones.