Put several red beans (depending on the size of the hand warmer) into a bag made of cotton or materials that can be put into the microwave oven (a more creative method: roll up socks, gloves, sleeves, pillowcases and even towels, and tie them with rubber bands at both ends to play freely), tie the mouth tightly, put them into the microwave oven, and then take them out.

Personally, it is better to use coarse salt for hot compress, which has a good effect on neck, shoulder, waist and leg pain, especially for gynecological diseases.