Stiff joints occur when there is a reduction in the range of motion due to inflammation or inactivity. Some synonyms for the term "stiff joints" include immobile joints, rigid joints, inflexible joints, arthritic joints, blocked joints, and tight joints. People who suffer from stiffness in their joints may also experience pain, swelling, or redness. Proper exercise, massage, and stretching can help alleviate symptoms of stiff joints. Regular exercise promotes the production of synovial fluid, which lubricates and nourishes the joints. Natural remedies like applying heat or cold to the affected area can also help reduce inflammation and stiffness.