Can an allergic reaction to poison ivy cause hives?

Yes, an allergic reaction to poison ivy can cause hives. When exposed to the urushiol oil found in poison ivy, the body's immune system may react, leading to symptoms such as hives, itching, and inflammation. These hives may appear as raised, red welts on the skin, indicating an allergic response. It's important to treat the reaction promptly to alleviate discomfort and prevent further irritation.