In many cases, the cause of angioedema is never found.

Most cases of angioedema will go away within a few days without treatment.

You develop symptoms of angioedema, particularly in the head and neck.

Associated angioedema has been reported in a few patients.

Angioedema is an allergic reaction in the deep layers of the skin.

This acquired angioedema is associated with the development of lymphoma.

If you develop symptoms of angioedema or anaphylaxis, get medical help immediately.

Hereditary angioedema was determined to have been passed on to a husband and wife from their mutual father.

Angioedema may appear as a reaction to a substance (allergen).

Since angioedema can worsen quickly, a person with this condition should be evaluated by a health professional.

It is also possible to have angioedema without hives.

The deeper swelling of angioedema may also be painful.

Angioedema that does not affect the breathing may be uncomfortable, but is usually harmless and goes away in a few days.

There are several different types of hives and angioedema, including:

This very rare form of angioedema develops in reply to contact with vibration.

An association with bradykinin has been proposed in the case of hereditary angioedema.

Bradykinin plays a critical role in all forms of hereditary angioedema.

Some patients develop angioedema due to increased bradykinin levels.

Angioedema is similar to hives, but the swelling occurs beneath the skin instead of on the surface.

Epinephrine may be life-saving when the cause of angioedema is allergic.

In the case of hereditary angioedema, treatment with epinephrine has not been shown to be helpful.

Aspirin can induce angioedema (swelling of skin tissues) in some people.

Swelling of the tongue or in the throat (angioedema) caused by an allergic reaction.

Chronic urticaria and angioedema: Hives lasting more than six weeks.

Various mechanisms that interfere with bradykinin production or degradation can lead to angioedema.