Swelling and pain at the junction of chin and neck may be caused by the lesion of submandibular gland, oral diseases or pharyngeal diseases. 1. Submaxillary gland lesion: if the submaxillary gland has purulent infection or tumor disease, this kind of submaxillary gland lesion will cause local pain symptoms, and may be accompanied by local tissue swelling. 2. Oral diseases: Infections in the bottom of the oral cavity or tumor diseases can also cause pain in the junction of chin and neck due to inflammation or infiltration of tumor. 3. Diseases at the throat: if there is swelling and pain at the junction of chin and neck, and also accompanied by some other symptoms, such as sore throat, unfavorable swallowing, hoarseness, etc., then it may be induced by acute pharyngolaryngitis, tonsillitis, and other diseases at the throat. In addition, the cause of this part of the swelling and pain symptoms are more causes, it is recommended that the patient should consult a doctor to confirm the diagnosis, should not be delayed, to avoid delaying the condition.