Many people at a young age, hand numbness, dizziness and other common problems of the elderly, these are generally often low head, rarely tilt the head to cause trouble. Our head weighs about 17-18 pounds, this weight needs bones and neck to support, the neck before and after the muscles to keep the balance, so that the head will not be biased to a certain side down. If you keep a posture does not move, such as long-term head down, the back of the muscle is loose, over time to lose flexibility, the head is easy to droop forward, and even affect the ligaments, joint capsule, small joints, resulting in a number of symptoms of cervical spondylosis. Doctor’s tip: Some people’s necks “rattling” when they move, may be ligaments loose or joint degeneration, the body issued the alarm. The joint surfaces are rubbing against each other, the bones and tendons are rubbing against each other, the bones and tendons are rotating because of the air flow will cause the “rattling” sound. At this time it is best not to twist the neck randomly, should go to the hospital as soon as possible to check.