The cause of sudden dizziness and lack of energy in patients has many aspects, which should be clarified based on the patient’s medical history as well as dizziness, lack of energy and other accompanying symptoms, and physical examination: if the patient is clinically manifested with recurrent episodes of dizziness and lack of energy, accompanied by symptoms of tinnitus and stuffy ears, and fluctuating hearing loss after multiple episodes, Meniere’s disease should be considered. Patients who are elderly and also have recurrent episodes of dizziness may be related to cerebral atherosclerosis. Patients in this category mostly have hypertension, diabetes mellitus, and hyperlipidemia, and patients need to consult a neurologist to improve the examination, clarify the condition, and then carry out symptomatic treatment, and patients should usually control the underlying disease. Patients with sudden dizziness and lack of energy should also consider heart-related diseases, such as sudden malignant arrhythmias and frequent premature ventricular contractions.