Common triggers include: Allergic reactions: Often caused by certain foods, medications, or insect stings Bacterial or viral infections: Illnesses such as colds, flu, or other infections can temporarily activate the immune system, sometimes triggering hives Spicy foods: Can irritate the skin or provoke histamine release in sensitive individuals Heat, cold, or sudden temperature changes: Rapid changes in temperature can cause the skin to react Stress or emotional triggers: Emotional strain may worsen or provoke hives in some people Pressure on the skin: Tight clothing, straps, or friction can sometimes trigger hives Exercise: Physical activity may induce hives in susceptible individuals Hormonal shifts: Changes during menstruation, pregnancy, or other hormonal fluctuations can contribute Your skin may also react more strongly when you are tired, run-down, or recovering from an illness
(PubMed) Klein EA, Thompson IM, Jr., Tangen CM, et al
50,51 This resulted in widespread public attention to NADs
doi: 10.1152/ajpendo.00429.2014 70 GutzwillerJPTschoppSBockAZehnderCEHuberARKreyenbuehlMet al
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