We will proceed with the diagnosis by checking whether the headache is repeated, the degree of the headache, and the neurological symptoms. We will distinguish the following diseases.

・ Tension headache

·Migraine

・ Cluster headache

・ Sinus headache

・ Neuralgia (trigeminal nerve, glossopharyngeal nerve, occipital nerve)

・ Headache associated with acute infections (cold, pneumonia, urinary tract infections, etc.)

·depression

・ Drug-induced headache due to withdrawal

・ Headache due to head and neck disease (toothache, temporomandibular joint disease, cervical spondylosis)

·subarachnoid hemorrhage

·cerebral hemorrhage

・ Meningitis / encephalitis

・ Vertebral artery dissection, internal carotid artery dissection

・ Intracranial occupying lesions (abscess, hematoma, tumor)

・ Glaucoma attack

・ Hypertensive encephalopathy (PRES: posterior reversible encephalopathy syndrome)

・ Cavernous sinus thrombosis

・ Temporal arteritis

・ Cerebrospinal fluid leakage (low cerebrospinal fluid pressure syndrome)

・ Internal carotid artery cavernous sinus fistula

・ Idiopathic increased intracranial pressure

​ Symptoms of headache suspected of subarachnoid hemorrhage include: 1. Sudden onset, 2. Painful headache that has never been experienced, 3. Unusual headache, 4. Increasing frequency and severity of headache, 5.50 These include the first headache after age, 6. headache with neurological loss and visual impairment, and 7. headache with closed eyes and quiet endurance. On rare occasions, some patients walked to the emergency department and were diagnosed with subarachnoid hemorrhage by CT examination. If you have any of the above symptoms, please call an ambulance.