It seems as if everyone has experienced the sharp ache in their shoulders and lower or upper back that causes a halt in your everyday activities and eventually a halt in your life. Lower aches are the most common and tend to be the result of damage or stress to discs, ligaments, tendons or muscles by overuse, unnatural positions or older age. Upper Aches are often caused by poor posture, consistent movement, injury or muscle strain. Shoulder pain is often a result of wear and tear in the cartilage or over usage. It can also be a result of tension from stress. Because the spinal column extends from the skull to the pelvis and is made up of 33 individual bones termed vertebrae, a backache or shoulder ache can affect several different parts of the body and have severe health consequences. Fortunately, You're one step closer to relieving pain! Our modelsT24AB, TS10ABV1, T40AB, CT15AB and etc. have specific modes to alleviate arm fatigue and back and shoulder pain.