https://www.medicalnewstoday.com/articles/321080.php

Allergies that cause swollen lips. An allergic reaction is an immune system response that occurs when the body reacts negatively to a ...

https://www.medicinenet.com/swollen_lip/symptoms.htm

May 6, 2019 ... Trauma or injury to the lip and mouth area is an obvious cause of swollen lips. Allergic reactions, either to foods, medications, or other ...

https://www.healthline.com/health/swollen-lips

The release of histamine can lead to classic allergy symptoms, such as sneezing ... Food allergies are a common cause of swollen lips.

https://www.merckmanuals.com/home/immune-disorders/allergic-reactions-and-other-hypersensitivity-disorders/angioedema

Angioedema is swelling of areas of tissue under the skin, sometimes ... and acquired angioedema resemble angioedema caused by an allergic reaction.

https://www.colgate.com/en-us/oral-health/conditions/dental-emergencies-and-sports-safety/swollen-lip-causes-and-treatments

Trauma, allergic reaction, infection and additional blood flow are swollen lip causes. When should you visit your doctor? Learn more, here.

https://www.merckmanuals.com/professional/dental-disorders/lip-and-tongue-disorders/lip-swelling

Cheilitis sometimes causes lip swelling, but patients typically present because of the ... Allergic reactions (eg, to foods, drugs, lipstick, airborne irritants, nickel).

https://www.verywellhealth.com/what-causes-swollen-lips-1192167

Swollen lips can be caused by many things; some are even life-threatening like angioedema. ... Swollen lips are a characteristic of oral allergy syndrome (OAS),  ...

https://www.mdedge.com/ccjm/article/94999/dermatology/persistently-swollen-lip

An otherwise healthy man has had asymptomatic swelling of his lower lip for 10 ... What is the cause? ... Response to treatment is often late and unpredictable.

https://www.nhs.uk/conditions/angioedema/

Angioedema is swelling underneath the skin. It's usually a reaction to a trigger, such as a medication or something you're allergic to. ... See your GP if you have episodes of swelling that affect your skin or lips and you're not certain of the cause.

https://www.nhsinform.scot/illnesses-and-conditions/skin-hair-and-nails/angioedema

Angioedema is the swelling of the deeper layers of the skin, caused by a build-up of fluid. ... eyes; lips; genitals; hands; feet ... allergic angioedema – the swelling is caused by an allergic reaction, such as a reaction to peanuts, and sometimes ...