1.Cautious and uninterrupted physical exercise, especially chest expansion; 2.Maintain correct posture, stand with chest up, abdomen and head up, eyes level; sit to keep chest upright; lie on a hard bed with low or no pillow; 3.Reduce or avoid physical activities that cause pain; Shen Hongbo, Department of Traditional Chinese Medicine, Peking University Third Hospital 4.Measure height regularly.