Allergic reactions: Exposure to allergens such as certain foods, medications, insect bites, or latex can lead to swollen lips.
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Angioedema: This is a condition similar to hives but involves deeper layers of the skin, resulting in swelling, often around the eyes and lips.
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Infections: Viral or bacterial infections, such as cold sores (caused by the herpes simplex virus), can cause swelling of the lips.
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Contact dermatitis: Coming into contact with irritants like certain cosmetics, lip balms, or even certain metals can lead to inflammation and swelling of the lips.
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Trauma: Accidental injuries, such as cuts, burns, or blunt force trauma to the lips, can cause swelling.
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Sunburn: Prolonged exposure to the sun without protection can lead to sunburned lips, resulting in swelling and discomfort.
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Oral herpes (cold sores): The herpes simplex virus type 1 (HSV-1) can cause cold sores, which may lead to swelling, blistering, and pain on or around the lips.
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Drug reactions: Some medications can cause allergic reactions or side effects that manifest as swelling of the lips.
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Autoimmune conditions: Conditions like lupus or sarcoidosis can cause inflammation and swelling in various parts of the body, including the lips.
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Anemia: Severe iron deficiency anemia can sometimes cause swelling of the lips and other tissues due to inadequate oxygen supply to the cells.