Lower lip suddenly swollen, hard common causes are mainly the following situations: First, patients with strenuous activities accidentally fall lower lip, can be accompanied by the formation of local hematoma, can be manifested as a hard texture, and accompanied by obvious swelling, pain. At this time, the patient can give ice local external compresses, reduce tissue exudation, to avoid the local hematoma progressive increase. 48 hours after the oral pain an, MaiZhiLing and other drugs, to improve local blood circulation, can promote the swelling, self-subsorption, the majority of patients in the 3-5 days after the swelling of the lips can be completely absorbed. Second, allergic patients in eating seafood, mango and other easily allergic food, will produce allergic reaction, manifested in the lower lip obvious swelling, hard texture. At this time, the patient needs to fast easy allergic food, at the same time oral paracetamol, loratadine and other anti-allergy drugs, to reduce the allergic reaction in the body, in the 24-48 hours, the swelling of the lower lip, the hard symptoms can be gradually relieved.