Swelling of the parotid area may be a symptom of mumps, pulpitis and enlarged lymph nodes. 1. Mumps: It is an acute infection, caused by the mumps virus through droplet or saliva infection, and the typical symptom is the patient’s parotid gland area is swollen and painful, which may be unilateral or both sides. 2. Pulpitis: If the patient’s teeth are decayed, but the patient does not treat it in time, it may lead to bacterial invasion of the nerve, making the inflammation spread and causing apical inflammation. The patient will have swollen cheeks and pain. 3. Enlarged lymph nodes: If the patient has upper respiratory tract infection, which is not controlled in time, the disease may spread. It manifests as redness, swelling and pain in the cheeks, pharyngitis, runny nose, nasal congestion and cough. It is recommended that patients with parotid swelling should seek timely medical attention and follow the doctor’s instructions to improve the examination.