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Parotid Gland Inflammation – Causes and Treatment

Parotid gland inflammation (parotitis) is an inflammation of the largest salivary gland. It can be caused by viral or bacterial infections, blocked ducts, or autoimmune conditions.

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Things worth knowing about "Parotid Gland Inflammation"

Parotid gland inflammation (parotitis) is an inflammation of the largest salivary gland. It can be caused by viral or bacterial infections, blocked ducts, or autoimmune conditions.

What Is Parotid Gland Inflammation?

Parotid gland inflammation, medically known as parotitis, is an inflammation of the parotid gland – the largest of the three paired salivary glands in the human body. Located in front of and just below the ear, the parotid gland produces a significant portion of saliva. Inflammation can affect one side (unilateral) or both sides (bilateral) and is typically accompanied by pain, swelling, and difficulty opening the mouth.

Causes

Parotitis can result from several different causes:

Viral parotitis: The most well-known cause is the mumps virus (a paramyxovirus), which causes the classic childhood illness known as mumps. Other viruses such as Epstein-Barr virus, cytomegalovirus, or parainfluenza viruses may also be responsible.
Bacterial parotitis: Bacteria such as Staphylococcus aureus or streptococci can enter the gland through the salivary duct, particularly when saliva flow is reduced due to dehydration, post-surgical conditions, or advanced age.
Obstructive parotitis: Salivary stones (sialoliths) can block the duct and trigger inflammation.
Chronic parotitis: Recurring episodes of inflammation, particularly in children, may occur without a clear infectious cause.
Autoimmune causes: Conditions such as Sjogren syndrome can lead to chronic inflammation of the salivary glands.

Symptoms

Common signs and symptoms of parotid gland inflammation include:

Painful swelling in front of and below the ear, often on one side (bilateral in mumps)
Tenderness when pressing on the gland
Difficulty chewing and opening the mouth
Redness and warmth of the overlying skin
Fever and general feeling of illness
In bacterial infection: pus discharged from the parotid duct (Stensen duct)
Dry mouth due to reduced saliva production

Diagnosis

Diagnosis is primarily clinical, based on physical examination and medical history. Depending on the suspected cause, additional investigations may include:

Blood tests: Elevated inflammatory markers (CRP, white blood cell count) indicate infection.
Ultrasound of the salivary glands: To assess gland structure, detect abscesses, or identify salivary stones.
Saliva culture and swab: In bacterial parotitis to identify the causative organism and test antibiotic sensitivity.
Serological testing: Antibody tests for mumps virus in suspected viral parotitis.
MRI or CT scan: In complicated cases or when an abscess is suspected.

Treatment

Viral Parotitis (Mumps)

There is no specific antiviral therapy available. Treatment focuses on symptom relief:

Rest and adequate fluid intake
Pain-relieving and fever-reducing medication (e.g., ibuprofen or paracetamol)
Cooling the swollen gland with cold compresses
Soft, easy-to-chew foods

Bacterial Parotitis

Antibiotics effective against common pathogens are the primary treatment (e.g., amoxicillin-clavulanate or clindamycin). If an abscess forms, surgical drainage may be necessary. Increasing fluid intake and stimulating saliva flow (e.g., with lemon juice or chewing gum) supports natural cleansing of the duct.

Salivary Stones

Small stones may pass on their own with hydration and gentle massage. Larger stones may require endoscopic or surgical removal.

Prevention

The most effective protection against viral parotitis caused by the mumps virus is vaccination. The MMR vaccine (measles, mumps, rubella) is recommended for all children by health authorities in most countries, including the WHO. Two doses provide reliable protection. To help prevent bacterial parotitis, adequate hydration is especially important for elderly or bedridden individuals.

References

World Health Organization (WHO): Mumps. Geneva, 2023. Available at: www.who.int
Mandel L: Salivary gland disorders. Medical Clinics of North America, 2014; 98(6): 1407–1449. PubMed PMID: 25443681.
Brennan MT, Sankar V, Leung KC et al.: Parotid gland disease. In: Oral and Maxillofacial Surgery Clinics of North America, 2021; 33(2): 151–164.

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