HAE attack management

HAE attack management refers to the specific treatment strategies used to control sudden episodes of severe swelling caused by hereditary angioedema, a rare genetic condition affecting a protein called C1-inhibitor. Attacks can affect the skin, abdomen, or, most seriously, the airway, and need a clear action plan. Having the right medication available and knowing how to use it quickly is central to safe management.

Attacks can be triggered by physical trauma, dental procedures, infections, stress, and certain medications such as ACE inhibitors or oestrogen-containing contraceptives, though many attacks occur without an identifiable trigger. Because triggers are not always predictable, having on-demand treatment readily available at all times is important. Some people notice early warning symptoms, such as tingling, before visible swelling develops.

Symptoms include swelling of the skin (face, limbs, or genitals), severe abdominal pain from swelling of the gut wall, or, most dangerously, swelling of the throat or tongue causing difficulty breathing or swallowing. Skin and abdominal attacks, while very uncomfortable, are not usually immediately life-threatening, whereas airway swelling is a medical emergency. Attacks typically build up over hours if untreated.

Yes, airway-involving attacks are potentially life-threatening and require emergency treatment and monitoring, which is why every person with HAE should carry on-demand treatment and have a clear emergency plan. Abdominal attacks, while not usually life-threatening, can be extremely painful and sometimes lead to unnecessary surgery if HAE is not recognised as the cause. With prompt appropriate treatment, most attacks, including airway attacks, can be managed successfully.

On-demand treatments include C1-inhibitor concentrate, icatibant, or ecallantide, given by injection as soon as an attack starts, ideally before it becomes severe. These specific HAE treatments work differently from those used for allergic swelling, since standard antihistamines, adrenaline, and steroids are not effective for HAE attacks. Anyone with HAE should have quick access to their prescribed on-demand treatment at all times.

Long-term preventive medication, taken regularly, can reduce the frequency and severity of attacks for people with frequent or severe episodes. Avoiding known personal triggers, where identifiable, and having short-term preventive treatment before procedures like dental work or surgery can also help. Your specialist immunology or allergy team will tailor a prevention plan to your individual attack pattern.

Untreated HAE attacks typically build up over several hours and can last two to five days before resolving on their own. Prompt use of on-demand treatment usually shortens this considerably, often bringing significant improvement within hours. This is one reason why having treatment readily available and using it early is strongly recommended.

HAE attacks are caused by a genetic C1-inhibitor deficiency and do not respond to antihistamines, adrenaline, or steroids, the usual treatments for allergic swelling reactions. Allergic angioedema is typically triggered by an allergen, often comes with hives or itching, and does respond well to standard allergy treatments. Because the correct emergency treatment differs so much between the two, anyone with known HAE should carry information or a card explaining this to emergency responders.

Seek emergency care immediately for any swelling affecting the throat, tongue, or causing difficulty breathing or swallowing, as this is potentially life-threatening. Use your prescribed on-demand HAE treatment as soon as an attack starts, following your individualised action plan, and still seek emergency assessment for airway symptoms even after treatment. Abdominal attacks causing severe pain should also be assessed, ideally by a team familiar with your HAE diagnosis, to avoid unnecessary investigations for other causes of abdominal pain.