The principle of the massage chair is to use mechanical rolling force and mechanical force to massage. Manual massage can dredge the meridians, circulate qi and blood, and maintain the balance of yin and yang in the body. Therefore, after massage, you can feel muscle relaxation and joint flexibility, invigorate people, relieve fatigue, and play an important role in ensuring physical health. For normal people, artificial massage can enhance the body's natural disease resistance and achieve health effects. However, the mechanical massage of the massage chair is different from the manual massage. Although the massage chair has several touch points, it cannot select acupuncture points, tap acupuncture points, or perform actions similar to manual massage. It just imitates the "kneading" and "pinching" movements of people. Therefore, the massage chair can only relieve fatigue, relieve discomfort, and have a relaxing effect, but it will not have a therapeutic effect. Moreover, its strength is not easy to control. When the strength is small, the effect is not large, and when the strength is high, it will cause muscle pain. In addition, there are some people who are not suitable for using massage chairs: First, patients with cardiac hypertension and osteoporosis. Because massage can speed up the blood circulation of the human body, it is easy to cause heart disease and hypertension patients; while osteoporosis is easy to cause bone brittleness due to calcium deficiency and other reasons, the massage force is strong, and it is especially easy to cause fractures. The second is patients with local skin damage, ulcers, bleeding, tuberculosis, and tumors. The third is people who are too hungry, oversatisfied, drunk or overly tired.