Occasional sudden buzzing of the head may be caused by insufficient blood supply to the brain due to atherosclerosis or hyperlipidemia, or transient tinnitus due to otitis media and other conditions. 1. Insufficient blood supply to the brain: it may be due to cerebral atherosclerosis, postural hypotension, hypoglycemia, etc., which causes transient ischemic attack and part of the brain function nerve disorder, resulting in the phenomenon of sudden buzzing in the head. 2. Transient tinnitus: it may be due to otitis media, vegetative nerve dysfunction and other causes of vestibular dysfunction, resulting in transient tinnitus attacks, which may be accompanied by hearing loss, dizziness and insomnia and other symptoms. In addition does not rule out due to lack of sleep, life stress and arrhythmia and other factors caused by the frequent occurrence of the symptom, should be promptly to the hospital neurology department for examination, after the cause is clear and active treatment.