Possible causes of neck pain after eating a full meal include cervical lymphadenitis, cervical spondylosis, and temporomandibular joint disorder syndrome. 1. Cervical lymphadenitis: Lymphadenitis is an inflammation of the lymph nodes caused by bacterial infection, often secondary to infections in other parts of the body. Inflammation of the cervical lymph nodes may lead to the symptom of pain in the neck after eating a full meal. 2. Cervical spondylosis: It may be due to playing cell phone with head down during the meal, and the cervical vertebrae keep a posture for a long time, which causes the strain of neck muscles and ligamentous tissues, leading to cervical spondylosis, and the symptom may also appear. 3. Temporomandibular Joint Disorder Syndrome: It may be due to trauma inside and outside the joints, anxiety, mental tension and other psychological factors. In addition, diet, bad bite, overloading of temporomandibular joints, bad habits and other factors can also lead to temporomandibular joint disorder syndrome, which can also present the symptom. There may be other reasons for neck pain after eating a full meal, it is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.