Some neck swelling may be present after an injury to the neck, but the swelling will go away once healing begins.
Common causes of neck swelling include:
Enlarged lymph nodes from an infection, such as a sore throat or from a cancerous tumor.
An enlarged thyroid gland from thyroid hormone changes.
Deep neck abscesses from a throat or mouth infection.
Cysts near the jaw, such as a thyroglossal duct cyst, or below the earlobe, such as a brachial cleft cyst.
Swollen salivary glands.
Mumps. Swelling of the parotid gland may cause facial and neck swelling.