Hives, also known as urticaria, are red, raised welts that appear on the skin. They can vary in size and shape and often come with itching or a burning sensation. Hives can occur anywhere on the body and may last for a few hours to several days. They are usually a reaction to allergens, such as certain foods, medications, or insect stings.
Understanding hives is important because they can indicate an allergic reaction, which may require medical attention. While many cases are mild and resolve on their own, some people may experience more severe reactions, including difficulty breathing or swelling of the face and throat. Knowing the signs of hives can help individuals seek timely care, especially if they are at risk for more serious allergic reactions.
Hives occur when the body releases histamine and other chemicals in response to an allergen. This release causes blood vessels to leak fluid, leading to the swelling and redness characteristic of hives. The immune system's reaction is meant to protect the body from perceived threats, but in the case of hives, it can overreact to harmless substances.
In some cases, the exact cause of hives may not be identified. Factors such as stress, temperature changes, or even exercise can sometimes trigger them. While they can be uncomfortable, they are usually not harmful and often resolve without treatment. However, it's important for individuals with frequent or severe hives to consult a healthcare professional to explore underlying causes and management options.