Sudden dizziness and weakness are more common in clinical practice, and their symptoms are commonly seen in the following situations: 1. Hypoglycemic reaction: diabetic patients have unsatisfactory control of blood glucose, and inappropriate use of hypoglycemic drugs and insulin, which leads to hypoglycemic reaction. In addition to dizziness and vomiting, these patients are often accompanied by cold sweating, pallor and blurred consciousness. It is necessary to measure blood glucose in time to determine whether it is a hypoglycemic state. If it is caused by hypoglycemia, it is necessary to consume sugar or steamed buns immediately, so as to make the blood glucose rise back up in time to alleviate the hypoglycemic reaction. If the patient’s blood sugar drop is not obvious, further diagnosis is needed; 2, myocardial infarction: myocardial infarction heart function decline leads to insufficient blood supply, may also appear dizziness, nausea and vomiting symptoms. Patients may have cold limbs, weak pulse, profuse sweating and other manifestations, but patients are conscious. It is recommended to stop the activity, rest immediately, and call 120 in time. Myocardial infarction is a very critical symptom, which requires timely treatment by professionals.