There are many reasons why the upper lip is swollen, and the common ones are angioedema, mosquito bites, trauma, infection, dental disease and other causes.
1. Angioedema: also known as giant urticaria, is a kind of occurrence in the subcutaneous loose tissue or mucous membranes of the limited edema, mostly due to contact with allergic reactions caused by sensitizers.
2. Mosquito bites: mosquito bites on the upper lip, toxin stimulation can also cause swelling of the upper lip.
3. Trauma: the upper lip is subjected to external pressure, bruises, car accidents and other stimuli, can also cause the upper lip swollen.
4. Infection: Bacterial, viral, fungal and other infections can also cause swelling of the upper lip.
5. Dental diseases: such as periodontitis, apical periodontitis, etc. can also lead to swelling of the upper lip.
There may be other reasons for a swollen upper lip, so you need to go to the hospital in time to get checked out and get a clear picture of the cause.