Using heat therapy to treat arthritis pain helps to relax muscles and stimulate circulation. It may be helpful to apply heat before doing stretching exercises, as it warms the muscles and helps them stretch. This article includes tips on how to use a hot water bottle or gel packs, heating pads and specific methods to use heat therapy on your hands. If you have hot, swollen joints, heat may not be helpful and ice may be more beneficial. If you have circulatory problems, consult your doctor.