There are many reasons for headache and numbness in half of the body: First, if the patient has a sudden severe headache or even numbness in half of the body, it is considered to be an acute cerebrovascular event, such as when the lesion is in the thalamus and the sensory center is damaged, it will cause the patient to have pain in the opposite limb, and if brain hemorrhage will cause the patient to have headache. Secondly, if the headache is chronic and half of the body is numb for a long time and gradually worsens, it should be considered to be caused by brain tumor occupying nature factor lesion, which can be clarified by doing head CT and head MRI. Thirdly, if there is no abnormal finding in head CT and head MRI, the headache and half of the body numbness may be the manifestation of neurological weakness and plant nerve disorder.