2017;9(3):212-219. Dermatographism: This is a common form of physical urticaria where hives form after firmly stroking or scratching the skin. Call your doctor immediately if hives appear after you have started taking a new medication or after you have been stung by an insect. Sometimes changes in temperature can induce hives in people who are sensitive to such changes. Read our, Medically reviewed by Corinne Savides Happel, MD, Medically reviewed by Casey Gallagher, MD, Verywell Health uses cookies to provide you with a great user experience. As a result, these blotches can occur either localized or all over the body. See our safe care and visitor guidelines, plus trusted coronavirus information. Mayo Clinic College of Medicine and Science, Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic School of Continuous Professional Development, Mayo Clinic School of Graduate Medical Education, Book: Mayo Clinic Family Health Book, 5th Edition, Newsletter: Mayo Clinic Health Letter — Digital Edition, FREE book offer – Mayo Clinic Health Letter. Insect bites and internal disease may also be responsible. While this can trigger the same inflammatory response seen with allergic hives, the appearance of the hives is often quite different. 8th ed.

In: Fitzpatrick's Dermatology in General Medicine. We include products we think are useful for our readers. The sweat itself doesn’t cause hives, but it indicates your body heat rising. • Hives vary in size (from a pencil eraser to a dinner plate), and may join together to form larger areas known as plaques. Call 911 immediately if you suspect anaphylaxis. Often, no cause is found for this chronic condition, and it usually goes away on its own after several weeks. The most noticeable symptom associated with hives is the welts that appear on the skin.

Dermographism urticaria is caused by friction or the firm stroking of skin. 2012;184(6):674. doi:10.1503/cmaj.111031. There are two allergies frequently associated with urticaria: Less commonly, hives may be caused by such common allergens as pollen, pet dander, insect bites, latex, or nickel. To relieve most uncomplicated episodes of hives, your doctor may suggest a lotion such as Sarna and an antihistamine. The skin reaction may be triggered by: In some cases, chronic hives may be related to an underlying illness, such as a thyroid disease or, rarely, cancer. Journal of Allergy and Clinical Immunology. Sometimes, they bring more than a small bump. When you have an allergic reaction, your body begins to release histamines into your blood. While not life-threatening, this form of hives can be uncomfortable and difficult to treat. Histamines are chemicals your body produces in an attempt to defend itself against infection and other outside intruders. The welts vary in size and appear and fade repeatedly as the reaction runs its course. http://www.acaai.org/allergist/allergies/Types/skin-allergies/hives/Pages/default.aspx. Be cautious when eating foreign fruits and vegetables. You may not need prescription treatment if you’re experiencing a mild case of hives not related to allergies or other health conditions. Accessed April 25, 2017. Symptoms include shortness of breath, muscle soreness, vomiting, and diarrhea. Histamines are chemicals your body produces in an attempt to defend itself against infection and other outside intruders. Chronic hives can be very uncomfortable and interfere with sleep and daily activities. The best treatment for hives and angiodema is to identify and remove the trigger, but this is not an easy task. If you have allergies and you know which substances are likely to cause an allergic reaction, your doctor will suggest that you avoid any possible exposure to these factors. We comply with the HONcode standard for trustworthy health information -. The hives usually occur right where the skin was stimulated and rarely appear elsewhere.

In addition to physical stimuli, stress is commonly associated with the development or worsening of chronic hives. Because physical urticaria is believed to be related to autoimmunity (rather than induced by an external trigger), the condition is most often chronic and can last anywhere from one to several years. American Academy of Dermatology. How Long Does Coronavirus Live On Surfaces? Bernstein JA, et al., eds. New York, N.Y.: The McGraw-Hill Companies; 2012. http://accessmedicine.mhmedical.com. The high concentration of histamine in the decaying flesh triggers a food "pseudoallergy" with symptoms such as diarrhea, cramps, dizziness, and widespread hives.. 2017;9(3):189-190. One such example is cholinergic urticaria in which stress-related perspiration may instigate the development of heat rash.. Most rashes go away on their own. The most common foods that cause hives are nuts, chocolate, fish, tomatoes, eggs, fresh berries, and milk. While you're waiting for hives and swelling to disappear, here are some tips: If hives or angioedema occur with any of the following symptoms, contact your doctor right away: Pictures and symptoms of the red, scaly rash. Advertising revenue supports our not-for-profit mission. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Other cases are idiopathic, meaning that the cause is unknown. There are certain infections and diseases for which urticaria is common. Accessed April 25, 2017. Angioedema may also affect the hands, feet and throat. Our website services, content, and products are for informational purposes only. Cloudflare Ray ID: 5f10f40f5c9b27b4 The most common causes of hives are allergic reactions. Physical urticaria: Hives caused by direct physical stimulation of the skin -- for example, cold, heat, sun exposure, vibration, pressure, sweating, and exercise. https://www.aad.org/. If hives are an early sign of a whole-body reaction, other symptoms to look for include swelling of the tongue, lips or face; wheezing; dizziness; chest tightness; and breathing difficulties. Keep an antihistamine in your medicine cabinet and take it the first signs of hives or itching. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Most of these allergy-induced hives will resolve on their own when the allergy trigger (allergen) is removed. The most common causes are certain foods, medications, or infections.

In terms of allergens, hives can be caused by factors such a… Insect bites and internal disease may also be responsible. Call 911 or seek medical attention immediately if you develop a hive outbreak around your throat or on your tongue or have trouble breathing along with hives.