Symptoms of low blood sugar include extreme hunger, blurred vision, sweating, nausea and a fast heartbeat. In severe cases, the patient may experience stroke, seizure and loss of consciousness, notes WebMD.
Low blood sugar, also called hypoglycemia, arises from an insufficient amount of glucose in the blood or the production of too much insulin. Common causes include skipping a meal, drinking alcohol, taking too much insulin and increasing exercise while not eating enough. Symptoms of this condition vary from time to time and among people, and some people do not recognize early symptoms. Patients should regularly monitor their blood sugar levels, according to Mayo Clinic.