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Hives can also be classified by the purported causative agent. Many different substances in the environment may cause hives, including medications, food and physical agents. In perhaps more than 50% of people with chronic hives of unknown cause, it is due to an autoimmune reaction. [7] Risk factors include having conditions such as hay fever or ...
It is also important to rule out systemic diseases that can cause hives, such as vasculitis (urticarial vasculitis), Schnitzler's syndrome, Gleich's syndrome, or thyroid disease. [32] The specific symptoms, triggers, and results of skin and blood tests can help differentiate autoimmune urticaria from these other conditions.
Chronic spontaneous urticaria, despite its cause being unknown, is linked to a higher prevalence of autoimmune diseases, and is often worsened by triggers like stress, infections, certain foods, or nonsteroidal anti-inflammatory drugs. The hives and angioedema seen in CSU is thought to be linked to the degranulation of skin mast cells.
Diagnosing hives. To diagnose hives, your primary care provider or dermatologist will examine your skin and ask questions about your symptoms and any possible causes.
Your doctor will review your medical history, the medications you take, possible illnesses, and exposures to things that can cause hives. Some diseases, like thyroid conditions, rheumatoid ...
As it is often the result of scratches, involving contact with other materials, it can be confused with an allergic reaction, when in fact it is the act of being scratched that causes a wheal to appear. These wheals are a subset of urticaria (hives), and appear within minutes, in some cases accompanied by itching. The first outbreak of ...
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