In simple words: Mumps nephritis is a kidney problem that can happen if you get the mumps. Mumps is a virus that makes your salivary glands swell. If your kidneys get inflamed because of the mumps, it's called mumps nephritis. It can cause belly pain, swelling, and make it hurt to pee.

Mumps nephritis is an inflammation of the kidneys that occurs as a serious complication of mumps (epidemic parotitis), a viral disease caused by the mumps virus. The virus primarily affects the salivary glands, causing swelling.Mumps is highly contagious and spreads through respiratory droplets (coughing, sneezing), contact with contaminated surfaces, and sharing food or drinks. Nephritis, as a complication, can lead to abdominal pain, body swelling due to fluid retention, painful urination, and the presence of blood or pus in the urine. General mumps symptoms such as low-grade fever, fatigue, and body aches can also persist.

Example 1: A patient presents with parotitis (swollen salivary glands), followed by abdominal pain, edema, and hematuria. Lab results confirm mumps infection and impaired kidney function, leading to a diagnosis of mumps nephritis., A child with a recent history of mumps develops fever, malaise, and decreased urine output.Urinalysis reveals proteinuria and blood cells, indicative of nephritis as a complication., An unvaccinated individual experiences classic mumps symptoms, and subsequently develops signs of kidney inflammation. Serological tests confirm mumps, and kidney function tests indicate nephritis.

Documentation should include evidence of mumps infection (positive serology, clinical presentation), symptoms of nephritis (abdominal pain, edema, changes in urine), laboratory findings (urinalysis, blood tests for kidney function), and any imaging results (ultrasound, CT scan).