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Chronic spontaneous urticaria (CSU) also known as Chronic idiopathic urticaria (CIU) is defined by the presence of wheals, angioedema, or both for more than six weeks.The most common symptoms of chronic spontaneous urticaria are angioedema and hives that are accompanied by itchiness.
Chronic urticaria is defined as the presence of hives which persist for greater than six weeks. [31] Some of the more severe chronic cases have lasted more than 20 years. A survey indicated chronic urticaria lasted a year or more in more than 50% of those affected and 20 years or more in 20% of them. [32]
The first outbreak of urticaria can lead to other reactions on body parts not directly stimulated, scraped, or scratched. In a normal case, the swelling will decrease without treatment within 15–30 minutes, but, in extreme cases, itchy red welts may last anywhere from a few hours to days.
Autoimmune urticaria; Cholinergic urticaria; Chronic urticaria (ordinary urticaria) Cold urticaria; Dermatographism (dermographism) Episodic angioedema with eosinophilia (Gleich's syndrome) Exercise urticaria (exercise-induced urticaria) Galvanic urticaria; Heat urticaria; Hereditary angioedema (Quincke's edema) Localized heat contact urticaria
However, the understanding of urticaria as an autoimmune condition is a relatively recent development in medical history. [14] The term autoimmune urticaria refers to a subset of chronic spontaneous urticaria (CSU) cases where the immune system appears to play a significant role. This understanding began to evolve in the mid to late 20th ...
Acquired angioedema (AAE) can be immunologic, nonimmunologic, or idiopathic. [9] It is usually caused by allergy and occurs together with other allergic symptoms and urticaria. It can also occur as a side effect to certain medications, particularly ACE inhibitors. It is characterized by repetitive episodes of swelling, frequently of the face ...
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Chronic urticaria (long-term): can develop suddenly and will persist more than six weeks. [6] This type of urticaria is uncommon [6] and occurs in only 0.1% of the population. [7] 20% of people with chronic urticaria report still having problems 10 years after its onset. [7]