Numbness is defined as partial loss or hyperalgesia, which is subjectively manifested as self-conscious numbness or even loss of sensation in some tissues of the body, and is a type of superficial sensory disorder, where there may be hyperalgesia or loss of pain, warmth, and touch sensation of the skin and mucous membranes. Numbness symptoms may be related to physiological factors such as mechanical compression or cold stimulation, or pathological factors such as metabolic disorders, insufficient blood supply, poisoning or inflammation, etc. The severity of the disorder can be understood through superficial sensory examination. 1.Nociceptive examination: the subject needs to fully expose the examined area, and then the medical personnel will use the needle force that does not harm the skin to prick the patient’s skin evenly in the symmetrical area, so as to understand the scope and degree of nociceptive disorder; 2.Thermoplegia examination: the medical personnel will use 5-10℃ cool water and 40-45℃ hot water to touch the patient’s skin respectively in turn, and if the hot and cold cannot be correctly distinguished, it is a thermoacoustic disorder 3, tactile examination: the patient should close both eyes, and then the medical staff should use feathers or cotton wool to gently touch the local skin, if there is no feeling, it is tactile disorder. Numbness symptoms caused by mechanical compression or cold stimulation last for a short period of time and can generally be relieved locally by activities and massage. The duration of numbness symptoms caused by insufficient blood supply, metabolic disorders, poisoning or inflammation varies from person to person and requires treatment of the primary disease to alleviate the current situation; delayed treatment may affect normal life or even cause serious complications.