If the patient has sudden dizziness accompanied by panic and limb weakness: 1. Consider that the patient has hypoglycemic reaction, especially for patients with a history of diabetes mellitus, this symptom will be present when the blood glucose is less than 3.9mmol/L. 2. If the patient has a history of definite hypertension, when the high pressure is greater than 180mmHg or the low pressure is greater than 120mmHg, the patient will also have sudden dizziness, headache, panic, palpitations, and limb weakness. 3. In the case of acute cerebrovascular accidents, such as acute stroke, cerebral infarction, transient ischemic attack, cerebral embolism, cerebral hemorrhage, it will also cause sudden dizziness, headache, panic, and weakness.4. If the patient has cardiogenic diseases, such as coronary artery disease, unstable angina pectoris, and acute myocarditis, he or she will have the above mentioned symptoms at this time. 5.If the patient has hypokalemia and hyponatremia, there will also be weakness, panic and dizziness.