hives flare ups

Overview

Hives (also called urticaria) are raised, itchy bumps on the skin that appear suddenly. They happen when your body releases histamine, a chemical that makes small blood vessels leak fluid into the skin. A flare-up is when hives appear or get worse, often in response to a trigger.

Yes, hives are very common. About 1 in 5 people will have hives at some point in their life.

Anyone can get hives, but they are more common in women and in people who have allergies, asthma, or eczema. They can appear at any age.

Symptoms

Common symptoms

• Raised, red or skin-colored welts (bumps) that come and go
• Itching, which may be mild or severe
• Welts that change shape, move around, or merge together
• A warm or tingling feeling in the affected skin
• Swelling of the surface of the skin that may look like puffiness

Symptoms in children

• Same types of welts as adults
• More fussiness or trouble sleeping because of itchiness
• Possible scratch marks or broken skin from scratching
• If caused by an infection, a fever may also be present

Symptoms in older adults

• Itching may feel more intense
• Skin is often drier, so irritation may be worse
• Welts may take longer to heal
• Hives may be linked to medicines the person is already taking

Causes

Main causes

• Allergic reactions to foods (like nuts, eggs, or shellfish)
• Allergic reactions to medicines (such as antibiotics or pain relievers)
• Insect stings or bites
• Infections, including colds and viruses
• Physical triggers, such as pressure on the skin, cold, heat, or exercise
• Stress or strong emotions
• Sometimes no clear cause is found

Risk factors

• A personal or family history of allergies, asthma, or eczema
• Having an autoimmune condition
• Recent infections
• Taking certain medicines
• High levels of stress
• Being female

When to see a doctor

See a doctor urgently if:

• If you have signs of a serious allergic reaction, such as trouble breathing or throat swelling, call your local emergency number immediately.
• If hives are widespread, painful, accompanied by a fever, or not improving after a couple of days, seek same-day medical care.

Book a routine appointment if:

• Make a non-urgent appointment if hives keep coming back or last longer than a few weeks.
• Also see your doctor if hives are interfering with sleep or your daily life.

Diagnosis

A doctor will look at your skin, ask about your symptoms, and ask about possible triggers. They will also review your medical history and any medicines or foods that might be involved.

Tests that may be done

• Usually no tests are needed.
• Allergy tests (skin or blood tests) may be suggested if a food or medicine is suspected.
• Blood tests may be done to check for other conditions if hives are long-lasting.
• A skin biopsy (taking a tiny sample of skin) may rarely be needed.

What to expect at your appointment

The doctor may ask you to keep a diary of your symptoms, activities, and what you ate or came into contact with. You may get a plan for managing symptoms and a referral to a skin specialist (dermatologist) if hives are severe or persistent.

Treatment

Treatment focuses on relieving itching and swelling and on finding and avoiding triggers. Many people can manage flare-ups with home care and non-prescription products. If these are not enough, a doctor can offer stronger treatments.

Self-care at home

• Avoid known triggers, such as certain foods, heat, tight clothing, or pressure on your skin.
• Apply a cool compress to the itchy areas.
• Take a lukewarm bath with baking soda or oatmeal powder.
• Wear loose, soft, breathable clothing.
• Keep your bedroom cool at night.
• Try not to scratch, as scratching can worsen itching and cause skin damage.

Medical treatments

Medicines called antihistamines are often used to block the chemical that causes hives. Some are available over the counter, and others require a prescription. For more severe or long-lasting flare-ups, a doctor may recommend short courses of stronger medicines such as corticosteroids, or other therapies that calm the immune system. Always talk to your doctor or pharmacist about what is right for you.

When is surgery considered?

Surgery is not used to treat hives.

Living with this condition

Keep a diary to help identify triggers and patterns. When a flare-up happens, take quick steps like moving to a cooler room, removing tight clothing, and applying a cool cloth. Plan ahead by carrying any needed relief supplies, and let close contacts know what you do during an attack.

Lifestyle tips

• Find ways to reduce stress, such as deep breathing, meditation, or gentle movement.
• Get enough sleep, since tiredness can make itchiness feel worse.
• Avoid hot showers and baths; use warm or cool water instead.
• Choose unscented, gentle soaps and moisturizers.
• Avoid alcohol and spicy foods, which can make flushing worse for some people.

Diet and exercise

There is no special diet for hives, unless a specific food is causing your flare-ups. Eat a balanced diet and keep healthy snacks handy. Exercise is generally good, but if heat or sweat triggers your hives, try exercising in a cool environment and rinse off afterwards. If exercise gives you hives, ask your doctor how to manage this.

Mental health and emotional wellbeing

Living with itchy, unpredictable flare-ups can be frustrating and can affect sleep and confidence. It is normal to feel stressed or anxious. Speak with your doctor if hives are affecting your mood or quality of life. You can also ask about counseling or support groups.

Prevention

If you know your triggers, avoiding them is the best way to prevent flare-ups. For many people, however, hives are unpredictable and can appear even without a known cause. Keeping a symptom diary and working with your doctor can help you spot and avoid patterns.

Vaccines

There is no vaccine to prevent hives.

Screening programmes

There is no regular screening test for hives. If you have frequent flare-ups, your doctor may suggest allergy testing to look for triggers.

Complications

If left untreated

• In rare cases, hives can be a sign of a severe allergic reaction, which is a medical emergency.
• Chronic hives can disrupt sleep, work, and daily activities.
• Scratching too much can break the skin and lead to bacterial infections.
• Long-lasting, unexplained hives can be a clue to an underlying health condition that may need treatment.

Long-term outlook

The outlook is generally very good. Most flare-ups clear up within a day or two. Chronic hives can be frustrating, but about half of people improve within a year, and most eventually settle. Even when the exact cause is never found, symptoms can usually be controlled well with treatment and support.

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