Hot or cold for back pain?
On the other hand, some experts advocate heat or cold based on the potential effects on blood flow. Applying ice or a reusable gel pack constricts blood vessels and reduces swelling around the injury. This is particularly useful for conditions, like a sprained ankle, that cause significant swelling. Heat has the opposite effect, increasing blood flow to the area. This relaxes muscle fibers, which can help when you experience spasms or stiffness. Unfortunately, the medical evidence for both these treatments is slim. There is more support to use heat for back pain, because muscle tightness tends to predominate.
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