What Causes Angioedema?: Angioedema is the swelling of tissue under the skin. Allergies are a common cause of angioedema. Common allergens include foods, insect bites, plants, exercise, and medications.

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Hives and Angioedema

Hives are a sudden allergic skin reaction. Hives are raised reddish bumps that cause severe itching. Angioedema is similar to hives but the welts are larger and involve a deeper layer in the skin. Allergies, insect stings and bites, stress, exercise, and infections are common causes of hives and angioedema. In mild cases, no treatment is needed. Severe reactions should be treated by a health care professional.
Tongue Swelling Causes of Swollen Tongue

The medical term for swollen tongue is glossitis. Glossitis may be acute (sudden onset), usually severe, such as during an allergic reaction or from angioedema; chronic which may may indicate an underlying condition; or atrophic (also called Hunter glossitis), which occurs when many of the small, bumpy structures on the tongue (papillae) are lost, giving the tongue a smooth, red, glossy appearance
What Causes Body Swelling Edema

Swelling (edema) occurs when fluid accumulates in the body’s tissues. Swelling (edema) can happen anywhere in the body, but commonly occurs in the lower legs, hands, abdomen, or chest (in or around the lungs). Swelling can be a symptom of a serious medical condition, and when it occurs in the lungs it can be life-threatening.

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Tongue Swelling: Causes of Swollen Tongue The medical term for swollen tongue is glossitis. Glossitis may be acute (sudden onset), usually severe, such as during an allergic reaction or from angioedema; chronic which may may indicate an underlying condition; or atrophic (also called Hunter glossitis), which occurs when many of the small, bumpy structures on the tongue (papillae) are lost, giving the tongue a smooth, red, glossy appearance