For every inch that the head moves forward in posture, the weight of the head on the neck and back is increased by approximately 10 pounds!
In the example to the right, a forward neck posture of 3 inches increases the weight of the head on the neck by 30 pounds. The muscles on the back of the body must constantly engage to keep you standing erect.
Long term abnormal head and neck posture leads to muscle strain, disc herniations, arthritis, pinched nerves and instability. A major part of head, neck, jaw and shoulder pain is due to poor posture. According to the American Journal of Pain Management, posture and function are related in that poor posture is evident in patients with chronic, pain- related conditions, including lower back pain, headaches, and stress-related illnesses. If you are experiencing pain, tingling and/or numbness in your hand(s), more than likely the cause is your forward shoulder posture and a resulting nerve impingement. Therapeutic bodywork, along with proper workplace ergonomics, can relieve this problem.
Posture affects and moderates every function from breathing to hormonal production. Spinal pain, headache, mood, blood pressure, pulse and lung capacity are among the functions most easily influenced by poor posture.