Skin reactions like hives and angioedema can cause itchy bumps and swelling.
Hives (also called urticaria): Hives are raised, itchy welts on the skin. These welts can be tiny or large, and come in different shapes and sizes. They can appear anywhere on the body. Hives are often triggered by things like certain foods, medicines, or even stress. Sometimes, they're a sign of an allergic reaction. Most cases of hives are short-lived (acute), lasting just a few hours or a day or two. If hives last longer than six weeks, it's called chronic hives and might need more investigation by a doctor.
Angioedema: This is a type of swelling that occurs deeper in the skin. It often affects the face, lips, and sometimes other parts of the body. The swelling can be quite noticeable. Like hives, angioedema is often short-lived (acute), disappearing within a day or so. Most cases are not serious. However, swelling in the throat or tongue can be dangerous, as it can block breathing. This is a medical emergency, and you should seek immediate help.
Treatment: Both hives and angioedema are usually treated with antihistamine medications. These medications can help reduce the itching and swelling. If the swelling is severe or doesn't go away, a doctor will need to diagnose and treat the underlying cause.
Important Note: While most cases of hives and angioedema are harmless and go away on their own, it's crucial to seek medical attention if the swelling is severe, especially if it involves the throat or tongue, or if the symptoms don't improve.
Hives are skin reactions that can look different depending on skin tone. They might be a light pinkish color on fair skin, reddish on white skin, or purplish on darker skin tones. The raised bumps (welts) of hives can be itchy, with the itchiness varying from a mild tickle to a strong, uncomfortable feeling. These welts can be round, oval, or even snake-like in shape. They can be tiny, like a small pea, or as big as a dinner plate.
Most hives come and go quickly, disappearing within a day or two. This is called acute hives. Sometimes, hives last for months or even years, and this is called chronic hives.
Angioedema is similar to hives, but it affects deeper layers of the skin. It can happen on its own or along with hives. The signs of angioedema include:
Mild cases of hives and angioedema are often treatable at home. However, if your symptoms last for more than a few days, it's important to see a doctor.
If you think your hives or angioedema might be related to a known allergy, like a food or medicine, it could be an early sign of a more serious reaction called anaphylaxis. Anaphylaxis is a serious medical emergency.
Seek immediate medical attention (call 911 or go to the nearest emergency room) if you notice swelling in your tongue, lips, mouth, or throat, or if you have trouble breathing.
Hives and angioedema, often mild, can usually be managed at home. If your symptoms last longer than a few days, it's a good idea to see your doctor.
If you suspect your hives or angioedema are linked to something you know you're allergic to, like a food or medicine, it could be an early sign of a more serious allergic reaction called anaphylaxis. This is a medical emergency. Get immediate medical attention if you notice swelling in your tongue, lips, mouth, or throat, or if you're having trouble breathing. These are serious signs that need immediate care.
Many people get sudden, itchy welts (hives) and swelling (angioedema) without knowing why. Sometimes, these reactions are linked to specific things.
Food: A wide range of foods can trigger problems for those who are sensitive to them. Common culprits include shellfish, fish, peanuts, tree nuts, soy, eggs, and milk. These foods can cause an allergic reaction in some people, leading to hives and swelling.
Medicine: Certain medications can also cause hives or swelling. This includes antibiotics like penicillin, pain relievers like aspirin and ibuprofen, and some blood pressure medicines. If you're taking medicine and develop hives or swelling, talk to your doctor.
Airborne substances: Pollen and other substances in the air can sometimes cause hives. These reactions can also include problems breathing, like sneezing or coughing, because the reaction can affect the airways.
Insect bites and illnesses: Insect bites or infections can also be responsible for hives and swelling. These are other possible causes.
Hives and angioedema are fairly common skin conditions. If you've had these problems before, you might be more likely to get them again. Also, if you've experienced other allergic reactions, like a rash or difficulty breathing, you could be at a higher risk. Finally, having a family history of hives, angioedema, or a similar condition called hereditary angioedema, might also increase your chances of developing these issues. This means if someone in your family has had these problems, you might be predisposed to them as well.
Severe swelling, called angioedema, can be very dangerous. If the swelling happens in your tongue or throat, it can close off your airway, which is a serious medical emergency.
To help prevent hives and swelling (angioedema), follow these tips:
Stay away from things that cause them. If you know what makes your hives appear, try your best to avoid it. For example, if you know peanuts cause hives, try not to eat them. If you know certain plants trigger hives, avoid contact with them.
Clean up after exposure to potential triggers. If you've had hives from things like pollen or pet dander, wash your body with soap and water (a bath or shower) and change your clothes after being around them. This helps remove the trigger from your skin. If you've been playing with a cat and you know cats trigger your hives, take a shower and change your clothes. This helps stop the hives from starting or getting worse.
Doctors diagnose hives (also called urticaria) and swelling under the skin (angioedema) by examining the affected areas. They'll also ask about your health history, including any recent illnesses or exposures to potential allergens. Sometimes, blood tests or allergy skin tests are needed to help pinpoint the cause. These tests can help determine if an allergy is involved or if there's another reason for the hives or swelling.
Hives and angioedema are skin conditions that cause itching and swelling. Often, these symptoms go away on their own without treatment if they are mild. However, if the itching is intense, the swelling is significant, or the symptoms persist, treatment can help.
Treatment Options:
Antihistamines: These are the most common first-line treatment. They reduce itching, swelling, and other allergy symptoms. Over-the-counter (OTC) and prescription versions are available. Most antihistamines come in a form that doesn't make you drowsy. If these don't work, your doctor might suggest a different kind of antihistamine or a different approach.
Immune System Suppressants: If antihistamines aren't enough, your doctor might prescribe medications to help regulate your immune system. This is often needed for cases where the immune system is overreacting.
Hereditary Angioedema Medications: If your angioedema is a hereditary condition (meaning it runs in your family), specific medications can help manage the symptoms by regulating the levels of certain proteins in your blood.
Corticosteroids: For severe hives or angioedema, doctors sometimes prescribe a short-term course of oral corticosteroids, like prednisone. These powerful anti-inflammatory drugs can reduce swelling, inflammation, and itching quickly. However, they are typically used only for short periods because of potential side effects.
Severe Cases and Emergencies:
In cases of severe hives or angioedema, immediate medical attention is essential. This might include a trip to the emergency room and an injection of epinephrine (adrenaline). If you have a history of severe attacks or your attacks happen repeatedly despite treatment, your doctor might recommend carrying an epinephrine auto-injector (like an EpiPen) for self-administration in emergencies.
Important Note Regarding Email Sign-Up:
The included text at the end is a separate matter related to subscribing to Mayo Clinic's email newsletter. It explains how they collect and use your email address and other information, including how to opt out of their emails. This section is unrelated to the medical information about hives and angioedema.
Getting help for skin problems like hives or swelling (angioedema) often starts with your primary doctor. Sometimes, they'll refer you right away to a dermatologist (skin doctor) or an allergist (allergy specialist). Here's how to prepare:
Preparing for your appointment:
What your doctor might ask you:
Your doctor will likely ask you questions to understand your situation better. They might ask about:
By being prepared with information about your symptoms, medications, and questions, you can have a more productive discussion with your doctor, leading to a faster diagnosis and better treatment plan.
Disclaimer: August is a health information platform and its responses don't constitute medical advise. Always consult with a licenced medical professional near you before making any changes.