Dizziness is a common and frequent disease. Many people think that dizziness is a minor problem; they get dizzy when they are hungry, they get dizzy around their periods, and they get dizzy when they stand up after squatting for a long time. Some patients with severe dizziness go to the hospital, mostly to the neurology clinic, but there are still some patients who have undergone many tests, including head CT and MRI, and have taken a lot of drugs, but the dizziness is not cured. As a result, not long afterwards, syncope may occur and a cerebral infarction may occur – a situation that is not uncommon in clinical practice. What causes such situations? It is true that many cases of dizziness are due to inadequate blood supply to the cerebral arteries. about 2/3 of people over 60 years of age have chronic cerebral insufficiency and can experience dizziness, tinnitus, blurred vision, hand tremors, insomnia, excessive dreaming, poor mental performance, and easy fatigue. However, it is important to note that many cardiovascular diseases can also present with dizziness. For example, a heartbeat that is too fast or too slow or hypertension can cause dizziness. As you know, one of the major functions of the heart is to ensure the blood supply to all organs of the body, thus maintaining the function of these organs. Our daily heartbeat is about 108,000 times, and the brain is very sensitive to ischemia and hypoxia. You can feel dizzy if you are deprived of oxygen for more than 3 seconds, convulsions can occur if you are deprived of oxygen for more than 5 seconds, and brain death can occur if you are deprived of oxygen for more than 10 seconds. If the heartbeat is too slow, the heart cannot supply blood to the brain, which can lead to insufficient oxygen supply to the brain, resulting in dizziness, fainting and even death. The problem is that some of the slow heartbeats are transient and are not always captured in a few seconds when an ECG is routinely done, so they are easily missed. As a result, when the patient has an ECG with no problems, he or she assumes that the heart is fine and is treated for insufficient blood supply to the cerebral arteries, which never gets better until syncope or cerebral infarction occurs.