The main symptom of angioedema is swelling that develops below the skin's surface.
Swelling caused by angioedema can develop suddenly or come on gradually over a few hours. It normally lasts a few days.
The swelling most often affects the:
In severe cases, the inside of the throat or bowel can be affected.
Often, the swelling occurs with a raised, itchy rash called urticaria (hives).
The rash will usually settle in a few days.
Otherwise, the skin over the swelling may feel tight and painful but look normal.
Less common symptoms of angioedema include:
See your GP if you have episodes of swelling that affect your skin or lips and you're not certain of the cause.
You may need to have some tests to determine the cause. Read more about tests for angioedema.
Dial 999 for an ambulance if you, or someone with you, has swelling and:
These are signs of a serious allergic reaction (anaphylaxis). If you, or the person who's ill, have been prescribed an adrenaline auto-injector for this, use it while waiting for the ambulance to arrive.