Tendon pain below the ear can be a widespread area of pain below the earlobe, behind the angle of the jaw and in front of and below the tip of the mastoid process, and may be caused by muscle strain, ear disease, parotid disease, mastoiditis and other causes. 1. Muscle strain: Muscle strain caused by trauma, improper neck activities, etc. can present the symptoms of pain in this area, which may be accompanied by limited neck and head activities. 2. Ear diseases: When the ear suffers from otitis media, infection of the external ear canal, ear tumors and other diseases, it can accumulate the performance of pain under the ear, often accompanied by increased ear secretion, pain in the ear and other symptoms. 3. Parotid disease: when parotitis or parotid tumor invades the area covered by the parotid gland under the affected ear, there will be pain, often accompanied by fever, swollen lymph nodes in the neck and other symptoms. 4. Mastoiditis: After the inflammation of mastoid, the pus penetrates the mastoid bone, and Bezold abscess or deep neck abscess can be formed, that is, there is pain in the area below the ear. When you have pain in the tendons below the ear, you need to go to the hospital in time to check the specific cause and standardize the treatment, so as not to delay the condition.