Sudden dizziness, nausea and cold sweat are more likely to come from hypoglycemia, especially in patients who usually do not have a good diet, irregular diet, or who have diabetes and may have hypoglycemic reactions due to over-application of insulin or medication while receiving hypoglycemic treatment. You can check the blood sugar level nearby, and if it is significantly lower, it also confirms our diagnosis. Promptly give the patient sugar supplements, either orally or intravenously, which can be quickly turned to normal after active treatment. In addition, consider whether the patient has heat stroke, especially those who work or exercise in a hot environment, and may experience dizziness, nausea, and cold sweats. Promptly move the patient to a cooler place, replenish fluids, and rapidly lower the body temperature. In addition, if the patient usually has underlying diseases, such as gastrointestinal diseases or hepatobiliary diseases, causing acute visceral bleeding, severe bleeding may cause symptoms of anemia, and sudden dizziness, nausea and cold sweats may occur. This condition only occurs in patients with underlying diseases, so it is important to be alert, improve relevant examinations and give appropriate treatment in a timely manner.