Hives are an itchy raised rash that usually gets better within a few days, and they can often be treated at home with antihistamines. The NHS is straightforward about it: the main symptom is an itchy rash of raised bumps or patches, in many shapes and sizes, which can appear anywhere on the body.

The mechanism explains the treatment. You get hives when something causes high levels of histamine and other chemicals to be released in your skin, which is why an antihistamine is the direct answer rather than a cream for the surface.

There is one situation where hives are not a minor problem, and it is worth knowing before you need it. Swelling of the lips, mouth, throat or tongue, or any difficulty breathing, is an emergency.

Key takeaways

  • Hives usually clear within a few days and can often be managed at home.
  • They are caused by histamine release in the skin, which is why antihistamines are the main treatment.
  • A pharmacist can advise on antihistamines, but tell them about any long-term condition, since you may not be able to take them.
  • Swelling of lips, mouth, throat or tongue is an emergency. So is difficulty breathing or a tight throat. Call emergency services.
  • Get urgent advice if the rash spreads or if symptoms do not improve after 2 days.
  • Some antihistamines cause drowsiness and some do not, and that difference matters if you drive.
  • Heat and sweat trigger hives in some people, which is a live consideration in this climate.
  • Hives lasting more than six weeks is a different problem, chronic urticaria, and is managed differently.

What do hives look like?

Raised itchy bumps or patches, varying in size, appearing anywhere on the body.

The rash can be raised bumps or patches in many shapes and sizes, and can appear anywhere. Individual welts often come and go within hours, moving around the body, which distinguishes hives from most other rashes: a patch that was on your arm this morning may be on your leg this evening.

On brown and black skin the rash may not look red at all. The NHS image guidance covers light brown and dark brown skin explicitly, and on darker skin hives often present as skin-coloured or slightly darker raised bumps rather than as a red rash. Feeling the raised welts is often more reliable than looking for colour, which matters for a readership where most people do not have white skin.

When is this an emergency?

When there is swelling of the airway or any difficulty breathing. Call emergency services immediately.

The NHS lists the signs that require an immediate 999 call in the UK, and the equivalent local emergency number elsewhere:

  • lips, mouth, throat or tongue suddenly becoming swollen
  • breathing very fast or struggling to breathe, becoming very wheezy, or feeling like you are choking or gasping for air
  • the throat feeling tight, or struggling to swallow
  • skin, tongue or lips turning blue, grey or pale, which on black or brown skin may be easier to see on the palms of the hands or soles of the feet
  • suddenly becoming very confused, drowsy or dizzy
  • someone fainting and not waking
  • a child becoming limp, floppy or not responding normally

A swollen, raised or itchy rash may accompany any of these. This is anaphylaxis, and it is treated as an emergency regardless of how the rash itself looks.

Separately, ask for an urgent appointment or call a medical helpline if hives symptoms do not improve after 2 days, if the rash is spreading, or if you are worried about a child’s hives.

What treats hives?

Antihistamines, with stronger options where those are not enough.

Antihistamines are the main treatment. A pharmacist can give advice on them, and the NHS adds two cautions worth repeating: tell the pharmacist if you have a long-term condition, because you might not be able to take antihistamines, and the treatment may not be suitable for young children.

The practical distinction on the shelf here is between the two generations:

  • Less-sedating antihistamines such as desloratadine and bilastine are usually the first choice for daytime use, because they control the itch without the drowsiness.
  • Sedating antihistamines such as hydroxyzine (sold here as Atarax) and cyproheptadine are older and cause drowsiness. That drowsiness is sometimes useful, since hives that keep someone awake are part of the problem, but it is a real limitation if you drive or operate machinery.

Hydroxyzine is worth understanding properly because it turns up in two different contexts. It is used for itch and urticaria, and it is also used for anxiety, and people sometimes encounter it in one setting and are surprised to be offered it in the other. It is the same medicine with the same sedating effect either way.

From a doctor, the NHS notes that treatment might include menthol cream, antihistamines or steroid tablets, and that if hives do not go away with treatment you may be referred to a dermatologist.

Montelukast is sometimes added in chronic cases, and ciclosporin is used in severe chronic urticaria that has not responded to other treatment. Both are prescriber decisions rather than self-treatment.

What sets hives off?

A trigger causing histamine release, and the trigger is not always identifiable.

Common triggers include foods, medicines, insect bites and stings, infections, and physical stimuli including pressure on the skin, cold, and heat.

The heat one deserves attention here. Some people get hives specifically from a rise in body temperature, from exercise, hot weather, hot showers or stress. The welts are typically small and intensely itchy, and appear where the body has heated up. In a climate where you cannot avoid being hot, recognising this pattern is more useful than trying to eliminate the trigger: it changes the approach to timing antihistamines and to managing exertion rather than to avoidance.

Sweat trapped under clothing in heat is a related irritant, which is why rinsing off and changing after being outside helps some people more than any cream.

The NHS is also clear that you cannot always prevent hives, and for a substantial number of people no trigger is ever identified. That is a normal outcome, not a failure of investigation.

What if they keep coming back?

Hives lasting more than six weeks are called chronic urticaria, and that is a different conversation.

Acute hives are a short episode. When welts keep appearing for more than six weeks, the condition is chronic urticaria, and much of it is idiopathic, meaning no external trigger is found. That does not mean nothing can be done. Chronic urticaria is managed, often with regular rather than as-needed antihistamines, sometimes at higher doses under supervision, and with additional treatments where needed.

The important shift is from hunting for a cause to controlling the symptoms reliably. People often spend months on elimination diets for a condition that is not driven by food, while under-treating the itch.

Do and don’t

Do:

  • Take an antihistamine early rather than waiting to see if it settles.
  • Tell the pharmacist about any long-term condition before buying one.
  • Check whether the antihistamine you are given is a sedating one before driving.
  • Cool the skin, and rinse off sweat after being outside.
  • Seek urgent advice if the rash spreads or does not improve in 2 days.
  • Call emergency services for any swelling of the mouth or throat, or breathing difficulty.

Don’t:

  • Don’t assume a rash is not hives because it is not red; feel for raised welts.
  • Don’t scratch, which worsens the histamine release.
  • Don’t take hot showers to soothe the itch if heat is your trigger.
  • Don’t start an elimination diet before getting the itch controlled.
  • Don’t ignore facial or throat swelling, even if it seems mild at first.

Frequently asked questions

Are hives contagious? No. They are a reaction in your own skin to histamine release, not an infection that can be passed on, even when triggered by an infection elsewhere in the body.

Why do mine move around? That is characteristic of hives. Individual welts typically last hours and then fade, while new ones appear elsewhere. A single fixed patch that lasts for days is more likely to be something else and is worth showing to a doctor.

Can I take antihistamines every day? For chronic urticaria many people do, on medical advice, and that is a recognised approach rather than a workaround. Which antihistamine and what dose is a decision for a prescriber, particularly where higher-than-standard doses are being considered.

Where to go next

The allergy relief category lists what is stocked here, and urticaria and chronic idiopathic urticaria approach it from the diagnosis. If your symptoms are more nose and eyes than skin, allergy in the UAE covers that side.

MedicForce option: our antihistamine listings show active ingredient and strength, which is how you tell a sedating option from a non-sedating one.

  • Hives, NHS symptoms including how the rash appears on different skin tones, when to get urgent help, the emergency signs, and treatment.
  • Allergic rhinitis, NHS relevant where hives accompany other allergic symptoms.