Generally speaking, it is better to soak your feet for 20 ~ 30 minutes, and it is best to soak until your body sweats slightly. Because soaking feet mainly uses the water temperature to get through the meridians of the whole body. "The general principle is painless", and body sweating is a signal that meridians are unobstructed. However, if the body sweats a lot and the body loses too much water, it will make people collapse, especially some frail old people, so we should always pay attention to our physical condition.
It is also important to note that you should not soak your feet after meals. This is the same as not exercising and not taking a bath after a meal. Because the digestion of food in the stomach needs centralized blood supply, if blood and oxygen are dispersed to other parts to work at this time, it will easily lead to indigestion. Keep warm immediately after soaking your feet before going to bed, otherwise your skin pores will open and cold pathogens will easily enter.
When soaking feet, add some traditional Chinese medicine, which can make the efficacy absorbed by the skin and act on the human body. According to different groups of people, such as Artemisia argyi, it is recommended to soak feet with white vinegar for patients with hypertension, and cassia twig and safflower for those with poor blood circulation.