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Hot compresses or packs that become hot due to an internal chemical reaction. These devices typically consist of an outer pouch that contains some chemicals (e.g., calcium chloride or magnesium sulfate) and an inner pouch that contains water; the inner pouch is squeezed and a chemical reaction is generated so as to warm the fluid. Chemical hot compresses/packs are mainly intended to apply heat therapy to a specific body surface; they are used mainly to improve blood circulation and reduce pain, muscle spasms and joint stiffness.
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