Sudden tinnitus and dizziness may be caused by hypertension, hypoglycemia, anemia and other diseases. 1. Hypertension: Hypertension may be caused by heredity, bad habits, kidney disease, endocrine disease, cardiovascular lesions and other diseases. Patients may have headache, dizziness, tinnitus, loss of consciousness, arrhythmia and other symptoms. 2. Hypoglycemia: Hypoglycemia may be caused by insufficient sugar intake, insufficient sugar production, excessive sugar consumption, excessive sugar conversion and other factors. Patients may have symptoms such as dizziness, bleeding, palpitations, fatigue and tinnitus. 3. Anemia: The etiology of anemia is related to factors such as decreased erythropoiesis, excessive destruction of erythrocytes, and blood loss. Patients will have headache, dizziness, tinnitus, fainting and other symptoms, manifested as sudden tinnitus and dizziness. The occurrence of sudden tinnitus and dizziness may also be Meniere’s disease, etc. It is recommended to go to the hospital to clarify the cause.