A value of 103 milligrams per deciliter is not a low blood glucose level. However, a blood glucose level that falls below 70 milligrams per deciliter is harmful and causes low blood glucose or hypoglycemia, according to MedlinePlus. When untreated swiftly, hypoglycemia can result in fainting, seizures, coma or death.
Symptoms of falling blood glucose levels include headaches, anxiety, mood swings, blurred vision and fatigue. Unfortunately, hypoglycemia happens rather quickly. In such emergencies, the American Diabetes Association advises eating 15 to 20 grams of simple carbohydrates or glucose such as raisins, juice and honey, and to keep doing so until blood glucose rises to normal levels.