Several complications can occur as a result of mumps. Some of these complications can occur with mumps symptoms. In other cases, these complications may develop without mumps symptoms.
Complications of mumps can include:
Inflammation of the testes (orchitis)
Inflammation of the brain and/or tissue covering the brain and spinal cord (encephalitis and meningitis, respectively)
Inflammation of the ovaries and/or breasts (oophoritis and mastitis, respectively)
Spontaneous abortion, particularly in early pregnancy (miscarriage)