Nonsteroidal anti-inflammatory drugs, or NSAIDs, are a class of medications commonly used to relieve pain, reduce inflammation, and lower fever. They work by inhibiting enzymes in the body that contribute to inflammation and pain signaling. Common examples include ibuprofen and naproxen. While NSAIDs are effective for many conditions, such as arthritis and headaches, they can have side effects, including stomach irritation and increased risk of bleeding. It's important to use them as directed and consult a healthcare professional if you have any concerns or pre-existing conditions.