Diclofenac is a nonsteroidal anti-inflammatory drug used widely to relieve pain and inflammation. It is relied on to treat a variety of conditions such as arthritis, back pain, and menstrual cramps. Diclofenac works by inhibiting certain enzymes (COX) responsible for producing prostaglandins, which reduces pain and swelling. It can be used in the form of tablets, topical gel, or injections, and is considered an effective option for relieving both acute and chronic pain. It should be used with caution, taking into account potential side effects, especially in individuals with chronic health conditions.