2, wormwood pillow can not be used for too long: no matter what method you choose to use wormwood, you can not use it for too long. This is because wormwood is cold, so if you use this Chinese herbal medicine for a long time, it will easily lead to the invasion of cold pathogens, which is not conducive to your health. If the elderly feel dizzy and dreamy, it is not advisable to take wormwood at this time.