Gum pain under the lump may be alveolar abscess, periodontal abscess, etc. caused. 1. alveolar abscess: gum pain under the lumps may be caused by alveolar abscess, will be through the apical foramen, to the root of the periphery to spread, resulting in patients infected with the root tip of the tooth, accompanied by tooth pain, loosening of the manifestations of the disease as it develops, the mucous membrane of the affected tooth will be red and swollen. 2. Periodontal abscess: the disease is pointed out in the periodontal pockets or deep periodontal connective tissue in the confined purulent inflammation, will lead to gum pain under the appearance of pimples, localized gums will be swollen protruding, gums red, loose teeth, fever, fatigue, etc., and some patients will have pus breakthroughs, outflow of the performance. It is recommended that patients go to a regular hospital, under the diagnosis of the doctor, according to the patient’s condition, to take targeted treatment, life should pay attention to oral hygiene, with the right way to brush teeth.