Half of the body numbness for three or four days is still a certain danger. Half of the body numbness is mainly seen in brain diseases, such as cerebral infarction, cerebral hemorrhage, brain tumors and so on. If cerebral infarction is caused, the disease is still in the acute stage, if combined with large blood vessel stenosis and other conditions, the condition may be aggravated, the infarction area is enlarged, and hemiparesis may occur; if cerebral hemorrhage is caused, the bleeding volume increases and the condition may be further aggravated. If the cavernous cerebral infarction caused by half of the body numbness is generally not dangerous, but still need to consult a doctor in time and standardized treatment. Half of the body numbness for three or four days, you should consult a doctor as soon as possible, under the guidance of the doctor to clarify the diagnosis and treatment, in order to avoid delaying the condition, leading to adverse consequences.