Symptoms and Characteristics of Hives
The main symptom of hives is the presence of itchy pink welts that tend to pale in the center and of ongoing outbreaks. This symptom is enough to make the diagnosis. The injury is evanescent (usually lasts less than twenty four hours) and changing. If less than six weeks speaks of acute hives and lasts longer, chronic hives. Chronic hives is more common in women from twenty to forty years of age. It may be associated with digestive symptoms such as abdominal pain or diarrhea, and respiratory symptoms with onset of respiratory distress. Hives caused by type I hypersensitivity reaction, often associated with angioedema and even severe forms such as anaphylactic shock. In immune-mediated hives urticaria-like vasculitis or serum sickness, injuries often last more than a day and may be accompanied by vasculitic lesions.
In hives caused by physical stimuli wheals last a few minutes and there is a refractory period in which even the patient's exposure to the stimulus, displayed no injuries.
- Dermographism: most frequent physical hives, about five percent of the general population suffers from it.
- Cholinergic Urticaria: hives small upper half of the chest caused by sweating (exercise, stimulation, heat, emotions) and produced by the release of acetylcholine
- Urticaria Aquagenic
- Solar Urticaria
- Cold urticaria: It is diagnosed by the ice-cube test
- Heat Urticaria
- Delayed pressure urticaria: In areas subject to continuous pressure (waist, buttocks, palms and soles). Itchy painful injuries there a time lag between the stimulus and the appearance of lesions that sometimes persist beyond 48 hours
- Vibratory Angioedema
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