Hives, medically known as urticaria, are raised, red, itchy welts that can appear anywhere on the body. They can vary in size, from tiny dots to large patches, and may come and go within hours or last for days. While many people assume hives are always caused by food allergies or insect bites, the reality is that their triggers are often unexpected, subtle, and surprisingly common. Medications are a frequent culprit. Even over-the-counter drugs such as ibuprofen, aspirin, and certain antihistamines can provoke hives in some people. Prescription antibiotics, particularly penicillin, or medications for high blood pressure may also trigger reactions. Hives can appear hours or even days after starting a new medication, so it’s essential to monitor your skin and discuss reactions with a healthcare professional.
Temperature changes and environmental factors are another set of common triggers. Heat hives can result from exercise, hot showers, or stress. Cold urticaria occurs after exposure to cold water, ice, or winter air, while rare cases of solar hives appear in response to sunlight. Stress and emotional anxiety, while not direct causes, can exacerbate existing hives or trigger chronic forms. The body’s stress response can overactivate the immune system, leading to flare-ups.
