Physical dysfunction, also known as limb dysfunction, refers to the gradual disappearance or weakening of the original normal functions of the human limbs, which have sensory and motor functions in normal people. The function of human lower limbs is mainly under the designation of the brain, under the coordination of the upper limbs and trunk can complete running, walking, jumping and other movements, but also can make the correct judgment of temperature, pain and limb position. The function of the upper limb is more flexible and delicate than that of the lower limb, and the function of the left and right limbs is symmetrical in normal people. Brain diseases, peripheral nerve injuries, spinal cord diseases, and limb trauma can lead to limb dysfunction, for example, patients with brain hemorrhage and cerebral infarction usually have weakness and difficulty walking on one side of the limb, and are unable to correctly distinguish pain, temperature, and position. When limb dysfunction occurs, patients should seek medical examination promptly.