Dizziness and limb weakness are considered to be caused by physiological factors and disease factors such as anemia, insufficient cerebral blood supply, neurological lesions, cerebral infarction and so on. 1. Physiological factors Emotional tension, work pressure, or anxiety and depression may lead to dizziness and limb weakness. After resting or removing triggers, the symptoms can be relieved on their own. 2. Disease factors (1) Anemia: The lack of sufficient red blood cells in the peripheral blood of the human body can lead to anemia, and patients will experience dizziness, lethargy, muscle weakness, fatigue and other symptoms. (2) Insufficient blood supply to the brain: hyperlipidemia and thrombocytosis can increase blood viscosity and slow blood flow; cerebral arteriosclerosis makes the inner diameter of cerebral blood vessels smaller, and blood flow in the brain decreases resulting in insufficient blood supply to the brain, which makes the patient prone to fatigue, dizziness, tiredness, and other symptoms, which are easily appeared or aggravated during the change of body position. (3) Neurological lesions: such as craniocerebral tumors, traumatic brain injury, and certain types of epilepsy. In addition, vegetative nerve dysfunction such as upright hypotension, insufficient cerebral blood supply caused by rapid reduction of blood pressure when standing, resulting in dizziness, dizziness, weakness of legs, vertigo, or even fainting, etc., are mostly seen in the elderly or frail people, as well as patients with certain neurological disorders will also often feel dizzy. (4) Acute cerebral infarction: it can develop in quiet state and during sleep, often accompanied by other neurological injury manifestations of brain parenchyma damage, especially cerebellar and brainstem lesions, which will result in dizziness, limb weakness, sensory impairment, dysarthria and swallowing disorders, and is often accompanied by arteriosclerosis and other vascular lesions. Dizziness and limb weakness can also be caused by other factors, it is recommended that patients with long duration of unrelieved dizziness should consult a doctor in time to clarify the cause and receive targeted treatment under the guidance of the doctor.