The heating belt that relieves low back pain and menstrual pain thanks to its long-lasting heating action. The thermoactive agents (iron powder and activated carbon) contained in the heating patches produce heat naturally when in contact with air. Once placed on the belt, the patches diffuse constant heat for 8 hours. This increases blood flow; which facilitates the elimination of metabolic waste and promotes tissue oxygenation. In addition, the heat improves muscle elasticity. Therefore, muscles relax, joint pain is relieved and, therefore, mobility is improved. Recommended for muscle pain, lumbago, muscle contractures, chronic or acute low back pain, muscle stiffness, joint pain and stiffness in the lumbar region and menstrual pain. Thermotherapy is an effective and natural method to relieve muscle pain through the application of local heat or cold, or both in succession.