A stiff neck results from slowed circulation and lymph flow to muscle tissues. Use contrast hydrotherapy—a quick blast of hot, then cold water—to get the blood pumping again. In the shower, first run hot water over your neck for 20 seconds to increase blood flow, then switch to cold for 10 seconds to constrict blood flow. Alternate three times, always ending with cold. When you get out of the shower, your body will send the blood back out to the skin, which results in a final dilation of blood vessels and—voilà!—a looser neck. 
Mint has been used for hundreds of years as a health remedy. Peppermint oil might help with irritable bowel syndrome -- a long-term condition that can cause cramps, bloating, gas, diarrhea, and constipation -- and it may be good for headaches as well. More studies are needed to see how much it helps and why. People use the leaf for other conditions, too, but there’s very little evidence it helps with any of them. 
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