What's with the buzz?

The most common reason why the head is always buzzing is intracranial vascular disease, such as cerebral atherosclerosis, arteriovenous malformation, intracranial aneurysm, cerebral infarction, etc., hypertension or hypotension, neurotic tinnitus, Meniere disease, cerumen of external auditory canal, poor sleep, staying up late, etc. can also cause the head to always buzz.