Salt hot compress method:
Stir-fry salt in an iron pan, or dry it in a microwave oven. Generally, stir-fry with domestic gas or natural gas for about 5-8 minutes, and microwave for about 3-4 minutes. Turn 1 time every 1 minute when you just cook, and you can turn it more frequently when you fry later. Sometimes if the fire is not very big, the coarse salt will not crack even if it is very hot. Wait until the coarse salt makes a noise, and then put it into a thick cloth bag.
Generally, hot things are applied to the stomach to relieve stomach pain or keep warm.