Hot therapy heating pads or heat packs should never be used on an acute injury in the first instance. We recommend the use of microwavable heating pads for the latter stages of an acute injury or for chronic conditions caused by biomechanical issues or overuse. Heat treatment decreases joint stiffness, increases the elasticity of connective tissue and reduces pain by increasing blood circulation to the affected area. Microwavable heating pads are an effective self-care treatment for conditions like rheumatoid arthritis.