Dizziness after a fall is caused by insufficient blood supply to the cerebral arteries after a change in body position, and the common diseases are as follows:1. Anemia is a common blood system disease, which can be divided into mild anemia, moderate anemia, severe anemia and so on, and it can appear with symptoms such as pallor, conjunctival pallor, dizziness, and weakness of the limbs, etc., and the simplest way to confirm the diagnosis is routine blood test.2. Patients with high blood pressure and low blood pressure may cause temporary cerebral arterial blood supply insufficiency and other causes of dizziness, usually need to monitor blood pressure. If the blood pressure is high, you can take oral antihypertensive medication. 3, cerebrovascular disease, if you usually have a history of hypertension, after a fall may cause cerebral hemorrhage and dizziness symptoms should be vigilant, as soon as possible to the hospital for further examination to confirm the diagnosis of such as blood lipids, blood pressure, cranial MRI and so on.