Urticaria causes
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Urticaria Causes: Immune Response, Mast Cell Activation, and Histamine Release
Urticaria, commonly known as hives, is primarily caused by the activation of mast cells in the skin. When these cells are triggered, they release histamine and other inflammatory mediators, leading to the characteristic swelling and itching of urticaria. This process can be initiated by both immunoglobulin E (IgE)-mediated and non-IgE-mediated mechanisms, making the underlying causes diverse and sometimes difficult to pinpoint 1289+1 MORE.
Acute Urticaria Triggers: Infections, Medications, and Foods
Acute urticaria, which lasts less than six weeks, is often linked to infections (especially viral), new medications, and certain foods. Viral infections, particularly respiratory tract infections, are well-established triggers for acute urticaria in both children and adults. In children, herpesviridae infections are most commonly associated, while in adults, hepatitis viruses are more frequently implicated. The urticaria symptoms usually resolve once the infection is treated or controlled 4579.
Chronic Urticaria: Autoimmunity, Stress, and Idiopathic Factors
Chronic urticaria (lasting more than six weeks) is more complex. In up to half of chronic spontaneous urticaria (CSU) cases, autoimmunity plays a significant role, with autoantibodies targeting mast cell or basophil receptors. This autoimmune process leads to ongoing mast cell activation and persistent symptoms. However, in 80–90% of chronic urticaria cases, no clear cause is identified, and the condition is labeled idiopathic 1268+2 MORE.
Psychological factors such as anxiety and depression have also been found to be significant contributors to chronic urticaria, as well as the use of new medications. Other potential but less common associations include thyroid disease, certain infections, and low vitamin D levels, though these are not consistently observed across all populations 389.
Infections and Urticaria: The Role of Helicobacter pylori and Other Pathogens
Chronic urticaria can sometimes improve after successful treatment of persistent infections, such as Helicobacter pylori. While the exact mechanism is unclear, it is recommended to include infection screening, especially for Helicobacter pylori, in the diagnostic work-up for chronic urticaria, as treating these infections can lead to symptom remission in some patients 579.
Physical and Inducible Urticaria: Specific Triggers
Some forms of urticaria are inducible, meaning they are triggered by specific physical factors such as pressure, temperature changes, or sunlight. These subtypes have more clearly defined triggers compared to chronic spontaneous urticaria, where the cause is often unknown .
Conclusion
Urticaria is a multifactorial condition with causes ranging from infections, medications, and foods in acute cases, to autoimmunity, psychological stress, and sometimes persistent infections in chronic cases. Mast cell activation and histamine release are central to the development of symptoms. While many cases remain idiopathic, identifying and addressing underlying triggers—when possible—can help manage and sometimes resolve urticaria.
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Most relevant research papers on this topic
Association between urticaria and virus infections: A systematic review.
Urticaria may be triggered by or primarily caused by viral infections, with herpesviridae infections being the most common in children and hepatitis virus infections in adults.
Urticaria and infections
Successful treatment of persistent infections, particularly Helicobacter pylori, can significantly benefit patients with chronic urticaria.
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