Hives often appear suddenly on any part of the body. They may appear in one place, go away in a few hours and then come back in another place. In severe cases, hives may come and go for several weeks. For most people, they are not serious.
How long do hives last after allergic reaction?
Hives can last a variable amount of time. Usually, eruptions may last for a few minutes, sometimes several hours, and even several weeks to months. Most individual hives last no more than 24 hours.
What gets rid of hives from an allergic reaction?
The standard treatment for hives and angioedema are antihistamines that don’t make you drowsy. These medications reduce itching, swelling and other allergy symptoms. They’re available over-the-counter or by prescription. Anti-inflammatory drugs.
Do you always get hives with an allergic reaction?
Bottom line: An allergic reaction can occur without skin symptoms (e.g. hives or swelling) and not every reaction will always look the same, a person can have different symptoms each time.
Why do I suddenly have hives?
A sudden onset of hives (acute hives) usually has an identifiable cause or trigger — such as insect stings or bites, medications, certain foods, allergens, or infections. Acute hives go away within a few weeks and are usually effectively treated with antihistamines.
How do you calm down hives?
Wear loose-fitting, cotton clothes. Apply a cold compress, such as ice cubes wrapped in a washcloth, to the itchy skin several times a day—unless cold triggers your hives. Use anti-itch medication that you can buy without a prescription, such as an antihistamine or calamine lotion.
Can hives be a sign of something serious?
Hives appear as a rapidly spreading, red, raised and itchy rash in splotches or all over the body. Caused by an allergic reaction to medications or food, hives can be a sign of a life-threatening problem when accompanied by difficulty breathing and a drop in blood pressure.
How long does it take for hives to disappear?
Although hives can be highly uncomfortable to have, they are relatively harmless. Hives usually appear suddenly and go away on their own in a matter of days, hours, or even minutes. Chronic hives, however, can last for six weeks or more.
Does Benadryl help with hives?
Antihistamines relieve itching from hives and prevent allergic reactions. Some antihistamines react fast, like diphenhydramine (Benadryl®). Depending how severe the hives are, your healthcare provider may recommend daily over-the-counter (OTC) or prescription allergy medications, like loratadine (Claritin®).
What can be mistaken for hives?
Skin Conditions That Share Symptoms With Chronic Hives
- GettyImages. Symptoms of chronic hives. …
- Heat rash. Heat rash, also called miliaria or prickly heat, is characterized by raised, red bumps, which can be inflamed and itchy. …
- Contact dermatitis. …
- Rosacea. …
- Eczema. …
- Pityriasis rosea. …
- Urticarial vasculitis. …
What causes hives other than allergic reaction?
What causes hives? An allergic reaction usually triggers hives, but they can also be caused by other situations such as stress, anxiety, or exercise.
Why do I get hives but I’m not allergic to anything?
Up to 20% of people will develop hives at some time during their life. In most cases, hives are not due to allergy. Underneath the lining of the skin and other body organs (including the stomach, lungs, nose and eyes) are mast cells. Mast cells contain chemicals including histamine.
Do hives appear more at night?
Urticaria is known to affect up to 20 percent of the population and strikes people irrespective of age, race, or gender. 6 Hives most often appear in the evening or early morning just after waking. Itching is typically worse at night, often interfering with sleep.
When should I worry about hives?
When You Should Seek Medical Attention
In rare cases, hives could indicate a more serious reaction. You should seek out medical attention for hives if you observe the following: They persist for 6 weeks or longer. Effect your breathing or swallowing.
When should I go to the doctor for hives?
When to see a doctor
See your doctor if your symptoms continue for more than a few days. If you think your hives or angioedema were caused by a known allergy to food or a medication, your symptoms may be an early sign of an anaphylactic reaction.