Diclofenac (Voltaren) is used in treatment of arthritis and gout. It is used to relieve the pain, tenderness, inflammation (swelling) and stiffness caused by arthritis and gout. Voltaren also is used to relieve other pains including menstrual pain and pain after surgery or childbirth. To know more about the uses of Voltaren, you will need to speak to your doctor or pharmacist.