Hemiparesis, also known as hemiplegia, is a neurological emergency. The aura before an attack is a precursor action if there is numbness, discomfort, or mild weakness of the limbs for a few seconds or minutes. This condition is also known as transient ischemic attack, which is characterized by episodes of limb weakness and paralysis. If the episodes are recurrent and of similar severity, it should be considered to be caused by deep penetrating arteries in the brain. If the attack is progressive, it should be considered as a large vessel lesion or trunk lesion; and if the paralysis occurs suddenly, it should be considered as an embolic disease. Therefore, if a patient has paralysis of half of the body or has an aura or precursor movement, he or she must promptly visit a hospital for examination and treatment.