Only 20 years old old back pain common reasons for almost no participation in sports activities, long time to remain seated or standing position work, as follows: 1, usually almost no participation in sports activities: lumbar muscle strength is quite weak, the patient in the work or study will occur serious muscle pain symptoms, which may be accompanied by lumbar spine activity is limited, press the lumbar muscles will be sore. Strengthening the lumbar muscle strength training can improve lumbar pain, and can prevent the recurrence of lumbar pain symptoms. 2, long time to keep sitting or standing position: posture is too fixed will lead to lumbar muscle serious strain, the patient will have lumbar soreness, pain symptoms, accompanied by lumbar spine activity is limited and lumbar muscle weakness performance, through the massage, acupressure, localized hot compresses, etc. can improve the pain symptoms.