Differential diagnosis
Other conditions that may present similarly to hypoglycemia include the following:

Alcohol or drug intoxication
Cardiac arrhythmia
Valvular heart disease
Postprandial syndrome
Hyperthyroidism
Pheochromocytoma
Post-gastric bypass hypoglycemia
Generalized anxiety disorder
Surreptitious insulin use
Lab or blood draw error (lack of antiglycolytic agent in collection tube or during processing)

Signs and symptoms
Hypoglycemic symptoms are divided into two main categories. The first category is symptoms caused by low glucose in the brain, called neuroglycopenic symptoms. The second category of symptoms is caused by the bodys reaction to low glucose in the brain, called adrenergic symptoms. Everyone experiences different symptoms of hypoglycemia, so someone with hypoglycemia may not have all of the symptoms listed above. Symptoms also tend to have quick onset. It is important to quickly obtain a blood glucose measurement in someone presenting with symptoms of hypoglycemia to properly identify the hypoglycemic episode. Pathophysiology
Glucose is the main source of energy for the brain, and a number of mechanisms are in place to prevent hypoglycemia and protect energy supply to the brain. The body can adjust insulin production and release, adjust glucose production by the liver, and adjust glucose use by the body. The body naturally produces the hormone insulin, in an organ called the pancreas. Insulin helps to regulate the amount of glucose in the body, especially after meals. Glucagon is another hormone involved in regulating blood glucose levels, and can be thought of as the opposite of insulin.
The treatment of hypoglycemia unrelated to diabetes includes treating the underlying problem.Among people with diabetes, prevention starts with learning the signs and symptoms of hypoglycemia. Diabetes medications, like insulin, sulfonylureas, and biguanides can also be adjusted or stopped to prevent hypoglycemia. Frequent and routine blood glucose testing is recommended. Some may find continuous glucose monitors with insulin pumps to be helpful in the management of diabetes and prevention of hypoglycemia. Definition
Blood sugar levels naturally fluctuate throughout the day, however hypoglycemia, also called low blood sugar or low blood glucose, is when blood sugar levels drop below 70 mg/dL (3.9 mmol/L).Blood sugar levels are generally maintained between 70 and 110 mg/dL (3.9-6.1 mmol/L). Although 70 mg/dL (3.9 mmol/L) is the lower limit of normal glucose, symptoms of hypoglycemia usually do not occur until 55 mg/dL (3.0 mmol/L) or lower. The blood glucose level at which symptoms of hypoglycemia develop in someone with several prior episodes of hypoglycemia may be even lower. Whipples triad
The symptoms of low blood sugar alone are not specific enough to characterize a hypoglycemic episode. A single blood sugar reading below 70 mg/dL is also not specific enough characterize a hypoglycemic episode.