Tinnitus, a spontaneous ringing in the ear not caused by external sound sources, can present various sound characteristics such as the sound of cicadas, boiling kettles, roaring machines, and tidal waves. Head tinnitus is a term used in Chinese medicine, but modern medicine does not have such a term. From the perspective of modern medicine, the term tinnitus is unscientific, as there is no part or organ of the head that can produce sound. When one side of the tinnitus, the patient hears the sound from one ear, and when the sound of bilateral tinnitus is approximately equal, the tinnitus felt is in the brain, so it is mistakenly called tinnitus in the brain. In other words, the so-called tinnitus in the brain is actually still tinnitus. There are two types of tinnitus, pulsatile and non-pulsatile. Non-pulsatile tinnitus is a common type of tinnitus, in which the sound is continuous and does not change with the pulsating tone of the heartbeat. However, it is occasionally seen in diseases such as auditory neuroma, which requires a brain MRI (magnetic resonance imaging) to determine or rule out. There is no evidence of a definite relationship between tinnitus and lack of blood supply to the brain, so there is no need to be overly stressed. If an auditory neuroma or other intracranial pathology is ruled out by brain MRI, the most important thing is to relax. It is estimated that about 20% of the population has experienced tinnitus at one time or another, but only about 0.4% have been seen for a long period of time for this reason. Most of these people who have been troubled by it for a long time and are tossing and turning have personality or emotional abnormalities, such as depression and anxiety. Pulsatile or pulsatile tinnitus is less common and is caused by the change in tone of the blood flowing through narrow or abnormal blood vessels in response to the heartbeat. It can be seen in cerebral arteriovenous malformations or cerebral artery stenosis, but in normal people, if they lie on their sides in the dead of night on a pillow with good sound transmission (such as a buckwheat pillow), they can also hear pulsating sounds, which are caused by the compression of superficial scalp arteries and disappear when lying down. When pulsatile (or pulsating) tinnitus occurs, the arteries in the brain need to be examined, and brain MRI, brain CTA (CT angiography), MRA (magnetic resonance angiography), or cerebral angiography can be done if necessary.