There are many diseases that cause pain in the back of the head, such as elevated blood pressure, occipital neuralgia or migraine, which can cause pain in the back of the head, and pain in the back of the head after a cold or fever. In contrast, cerebral infarction is a localized necrosis of brain tissue due to the interruption of blood flow, which will be accompanied by symptoms of neurological deficits, such as hemiplegia or sensory numbness of limbs, clumsy speech, choking and coughing, dizziness, etc. It rarely causes headache. If it is a large cerebral infarction, the headache may occur due to cerebral edema, but a large cerebral infarction will cause the patient to have symptoms of neurological deficits, such as impaired consciousness or coma, and complete paralysis, and not just a simple pain at the back of the head. Therefore, if it is a simple pain at the back of the head, it is not considered to be a brain infarction, but may be a disease such as neurological headache or primary headache.