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An allergic reaction causing the lips to swell is an alarming condition, and it needs immediate medical attention, according to the Merck Manuals. Swollen lips may be a sign of anaphylactic shock, which can be life-threatening. Talk with a doctor for a professional diagnosis and treatment. Do not attempt to self-treat.
Some of the most common allergens that trigger lip swelling are medications, foods, insect bites, muscle relaxants and latex, according to MayoClinic.com. Anyone can develop an allergy to any medication. Swollen lips are a sign of a severe allergic reaction. Stop taking any medication that causes swollen lips and talk with the doctor. Certain foods such as milk, shellfish, nuts and eggs can cause swollen lips. Bees, wasps, hornets and fire ants are the most common insects that cause an allergic reaction of swollen lips.
www.livestrong.com/article/226924-allergic-reaction-swollen-lips/