Moist hot packs, in several layers of towels, are placed on the area needing treatment. The heat provided by the hot packs has several important benefits; It relaxes tight muscles causing tissues to relax. This decreases pain caused by muscle tension, or spasms. It also causes vasodilatation of the blood vessels which increases circulation to the area. Patients with muscle strains, spasms, or arthritis often benefit from treatment with moist hot packs.