Paralysis is a disease in which the lower extremities of the body completely or partially lose motor function and the random movements are reduced or lost after the occurrence of random movement or loss of sensory disorders. Central paralysis of the lower extremities is caused by lesion damage to the cortical motor projection area and upper motor neuron pathways, which can cause upper motor neuron paralysis. Common causes include cranial trauma, tumors, inflammation, cerebrovascular disease, degeneration, poisoning, and certain diseases of internal medicine, such as diabetes, hematoporphyria, macrocytic anemia, and vitamin B12 deficiency. The diagnosis can be confirmed by the light paralysis test. The light paralysis test is a test that can be done to help diagnose mild paralysis when the doctor is not sure about it by general methods during the neurological examination. The upper extremity paralysis test includes upper extremity flattening test, minor hemiplegic side pinky sign, finger counting test, finger muscle strength test, etc. The lower extremity paralysis test includes external rotation sign, knee drop test, heel against hip test, lower extremity drop test, etc. Upper extremity paralysis test: If the patient holds both upper extremities out in front of the chest for a few seconds and the upper extremities fall faster, it means there is occult paralysis. 2.Lower limb paralysis test: (1) The patient is in prone position, the examiner bends both knees and holds them in vertical position, and the affected limb gradually drops after a few seconds of letting go. (2) The patient is in the prone position and the heel touches the buttock by flexing the knee, and the examiner can see that the ankle and toe joints on the mildly paralyzed side cannot be straightened. (3) If the patient is supine and the hip and knee joints are flexed at right angles, and the affected limb cannot be supported and drops after a few seconds, it indicates early paralysis.