Not most people will have ischemic foci. Ischemic foci are most common in middle-aged and elderly people, especially in patients with hypertension and diabetes. The most common site of ischemia is the brain, which usually has an inadequate blood supply to the head. For example, cerebral arteriosclerosis, posterior circulation ischemia, or long-term vertebral artery type cervical spondylosis leads to poor blood circulation in the head, which makes it easy to develop ischemic foci, but most patients will more or less experience dizziness. In addition, the area prone to ischemia is the heart muscle, which is usually caused by thrombosis or blockage of coronary arteries, and is also common in patients with hypertension and diabetes. If there are ischemic foci in the heart muscle, there will also be uncomfortable manifestations of the heart, such as chest tightness, palpitations, arrhythmia, and in severe cases, chest pain and angina pectoris, which can be life-threatening.