The causes of sudden swelling of the mouth are mainly allergic factors, inflammatory factors, traumatic factors, etc..
1. Allergic factors: usually due to eating allergic food or taking allergic drugs, the lips appear angioneurotic edema, which is also manifested as a sudden swelling of the lips, generally can subside on their own, if necessary, under the guidance of a doctor to take antihistamines such as loratadine.
2. Inflammatory factors: when the teeth have inflammation, especially apical inflammation, inflammation has no place to release, there will be swelling of the gums and sometimes spread to the lips, timely root canal treatment.
3. Traumatic factors: due to external forces and other causes of injury to the lip area swelling, timely hospital to see if further treatment is needed.
4. Other: For example, mosquito bites on the lips can also appear in the above situation.
For the most pass suddenly appeared swelling, it is recommended to consult a doctor in time to clarify the cause of symptomatic treatment.