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Fewer than 5% of cases last for more than six weeks (a condition known as chronic urticaria). [2] The condition frequently recurs. [2] [4] Hives frequently occur following an infection or as a result of an allergic reaction such as to medication, insect bites, or food. [2] Psychological stress, cold temperature, or vibration may also be a trigger.
A food allergy is an abnormal immune response to food.The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure.
Symptoms of indoor allergies can occur year-round but tend to be more troublesome during the winter months when children are inside more often. [18] However, outdoor allergies, or seasonal allergies, normally change with the season. [19] The potential symptoms of a food allergy include: [10] [5] Tingling/itching in the mouth
Hives allergic reaction on arm. The pathophysiology of allergic responses can be divided into two phases. The first is an acute response that occurs within minutes to an hour or two exposure to an allergen. This phase can either subside or progress into a "late-phase reaction" which can substantially prolong the symptoms of a response, and ...
The hives usually disappear in a few hours after the test. In rare cases they can persist for a day or two. These hives may be itchy and are best treated by applying an over the counter hydrocortisone cream. [11] In very rare cases one may develop a full blown allergic reaction.
Signs and symptoms of anaphylaxis Hives on back. Acute soy allergy can have fast onset (from seconds to one hour) or slow onset (from hours to several days), depending on the conditions of exposure, [1] [3] whereas long-term soy allergy may begin in infancy with reaction to soy-based infant formula. [4]
Hives may appear immediately or after a delay. [17] Hives can last for a few minutes or a few days, and vary from person to person. Also, a burning sensation occurs. A serious reaction is most likely to occur for patients where the hives occur with less than three minutes of exposure (during a cold test). [18]
Aside from these ambient allergens, allergic reactions can result from foods, insect stings, and reactions to medications like aspirin and antibiotics such as penicillin. Symptoms of food allergy include abdominal pain, bloating, vomiting, diarrhea, itchy skin, and hives. Food allergies rarely cause respiratory (asthmatic) reactions, or ...
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