What are hives?
Hives, also often called hives, are swellings on the skin which are often itchy. Often they're pink or red, but they don't should be. Hives occur when skin cells called mast cells release histamine, a chemical that causes small blood vessels (capillaries) to leak fluid. When this exudative fluid accumulates within the skin, it forms a swelling often called a hive.
Hives could be triggered by physical aspects reminiscent of heat, cold, exercise, sunlight, stress, constant pressure on an area of skin (reminiscent of from a belt or shoulder strap), a sudden increase in body temperature (from a fever or a hot bath). can or shower) or from irritating chemicals, cosmetics or soaps applied to the skin. Hives may also be an indication of a whole-body allergic response to something that was:
- breathed – Pollen, animal dander, molds
- injection – Insect stings or bites, especially bee stings, or injection medication
- ate – Foods (tree nuts; fish and shellfish; dairy products; legumes, especially peanuts), foods, drugs reminiscent of penicillin or aspirin.
Hives likely affect about 20% of individuals within the United States in some unspecified time in the future of their lives, with the best variety of episodes occurring in people between the ages of 20 and 30. In rare cases, allergic reactions that trigger hives can trigger a sequence response throughout the body, resulting in a life-threatening condition called anaphylaxis. Sometimes, hives last for six weeks or longer, a condition called chronic (or idiopathic) urticaria. Often, there isn't any known cause for this chronic condition, and it normally goes away by itself after several weeks.
Symptoms of hives
Hives appear as “whales” (swellings) on the skin, sometimes pink or red and surrounded by a red rash. Usually round or oval, hives are sometimes itchy. Hives vary in size, and a few may mix to form large areas of swelling. Hives can affect the skin on any a part of the body, especially on the trunk, thighs, upper arms and face. Most individual hives disappear quickly, but latest crops may appear every 24 to 72 hours if the person continues to be exposed to the environment or a substance that triggers hives.
If hives are an early sign of a systemic response, other symptoms include swelling of the tongue, lips or face. wheezing dizziness chest tightness; and difficulty respiratory. If these symptoms appear, seek immediate medical attention. You can develop anaphylaxis, a life-threatening condition.
Diagnosis of hives
Your doctor will ask about your history of allergic reactions, and your recent exposure to pets, plants, insects, or latest foods or medications. During a physical exam, your doctor can normally distinguish between hives and other skin conditions. In addition, he'll check for other signs of a serious allergic response.
If this condition occurs regularly, your doctor may order a blood test or skin test for allergies. If your doctor suspects you're having anaphylaxis, he or she is going to start treatment immediately and closely monitor your blood pressure and respiratory.
Expected duration of the hive
Individual hives normally go away inside eight to 12 hours, but recurrent hives may keep reappearing for weeks or months. In cases of chronic urticaria (hives), the condition may last for six months or more.
Prevention of hives
You can prevent hives by identifying and avoiding certain situations or substances that trigger your skin's response. If your doctor determines that you've an allergy to insect venom, you might be advised to have an epinephrine kit for emergency injections to forestall anaphylaxis. If you're employed outside or play a sport, keep the drugs in an appropriate place. Keep an antihistamine in your medicine cabinet and take it at the primary sign of hives or itching. Older adults and folks with heart disease should double check with their doctor before taking an antihistamine.
Treatment of hives
To relieve probably the most severe episodes of hives, your doctor may prescribe a topical lotion or an antihistamine, reminiscent of cetirizine (Zyrtec, others) or loratadine (Claritin, others). Many over-the-counter antihistamines can be found. Generic versions work in addition to brand-name drugs. It is vital to remove the itch because the itch can trigger more hives and itching.
If these medications are usually not effective, you might be given prescription medications reminiscent of cyproheptadine (Periactin), hydroxyzine (Atarix or Vestaril), or desloratadine (Clarinex).
In cases which are more proof against treatment, H2 receptor blockers could also be added. These include nizatidine (Axid), famotidine (Pepcid) or cimetidine (Tagamet). Doxepin (Adapin, Sinequan) at bedtime is particularly helpful for individuals who have trouble sleeping due to itching.
When other options fail, drugs that suppress or alter the immune system could also be prescribed. These include omalizumab (Xolair), montelukast (Singulair), zafirlukast (Accolate) or corticosteroids (reminiscent of prednisone).
When to Call a Professional
Call your doctor immediately for those who've began taking a latest medication or have been bitten by an insect. Get emergency treatment for those who experience wheezing, dizziness, chest tightness, difficulty respiratory, or hives with swelling of the tongue, lips, or face.
Assessment
Most easy cases of hives go away quickly, and the affected skin returns to normal inside hours. Even when you've episodes that repeat for several weeks, for no apparent reason, they often stop coming back after a number of months. Consult your doctor if the hives persist for several days or if the itching interferes together with your ability to sleep or perform normal each day activities.
Additional information
American Academy of Allergy, Asthma and Immunology (AAAAI)
https://www.aaai.org/
American Academy of Dermatology
https://www.aad.org/