Syringomyelia happens when a fluid-filled cavity forms inside the spinal cord. The first clue is often a loss of feeling in the hands or arms. People burn or cut themselves while cooking and do not notice until they see the blister or blood. Hot drinks feel lukewarm, and sharp objects feel dull. Muscle wasting comes next. Grip weakens, making it hard to open jars or button shirts. Muscles between the thumb and index finger shrink, giving the hand a hollow look. Some notice their fingers curl and cannot be straightened. Pain shows up as a constant, aching burn across the... Learn more