Eventually, the bronchi become known as bronchioles â the smallest air tubes in the lungs. This system of air tubes can be thought of as an upside down tree, with the trachea being the main trunk and the bronchi and bronchioles being the branches. The medical term for all the air tubes is 'the respiratory tract'.
An injury to the vertebrae or discs in your neck can cause pain, numbness, or weakness in your shoulder, arm, wrist, or hand because the nerves that extend out from between the neck provide sensation and allow for movement in these areas.
Slow and gentle stretching of the hand or foot to ease the contracting muscle is the best way to stop this kind of cramp. Brand X Pictures/Brand X Pictures/Getty Images. If you have low levels of certain nutrients in your body, this can cause hand and foot cramps. If you have reduced levels of calcium and magnesium, that can bring on cramping. Lack of vitamin D can cause muscle spasms and cramps in your hands and feet.