These individuals are also at far greater risk of severe hypoglycemia.While the exact cause of hypoglycemic unawarenss is still under research, it is thought that these individuals progressively begin to develop fewer adrenergic-type symptoms, resulting in the loss of  neuroglycopenic-type symptoms. Neuroglycopenic symptoms are caused by low glucose in the brain, and can result in tiredness, confusion, difficulty with speech, seizures, and loss of consciousness. Adrenergic symptoms are caused by the bodys reaction to low glucose in the brain, and can result in fast heart rate, sweating, nervousness, and hunger. See section above on Signs and Symptoms for further explanation of neuroglycopenic symptoms and adrenergic symptoms. In terms of epidemiology, hypoglycemic unawarenss occurs in 20-40% of type 1 diabetics. Other causes
Other causes of hypoglycemia in diabetics include the following:

Fasting, whether it be a planned fast or overnight fast, as there is a long period of time without glucose intake
Exercising more than usual as it leads to more use of glucose, especially by the muscles
Drinking alcohol, especially when combined with diabetic medications, as alcohol inhibits glucose production
Kidney disease, as insulin cannot be cleared out of circulation well

Non-diabetics
Serious illness
Serious illness may result in low blood sugar. Severe disease of many organ systems can cause hypoglycemia as a secondary problem. Hypoglycemia is especially common in those in the intensive care unit or those in whom food and drink is withheld as a part of their treatment plan.Sepsis, a common cause of hypoglycemia in serious illness, can lead to hypoglycemia through many ways.
Other medications with very low quality evidence include the antibiotics levofloxacin and trimethoprim-sulfamethoxazole, progesterone blocker mifepristone, anti-arrhythmic disopyramide, anti-coagulant heparin, and chemotherapeutic mercaptopurine.If a person without diabetes accidentally takes medications that are traditionally used to treat diabetes, this may also cause hypoglycemia. These medications include insulin, glinides, and sulfonylureas. This may occur through medical errors in a healthcare setting or through pharmacy errors, also called iatrogenic hypoglycemia. Surreptitious insulin use
When individuals take insulin without needing it, to purposefully induce hypoglycemia, this is referred to as surreptitious insulin use or factitious hypoglycemia. Some people may use insulin to induce weight loss, whereas for others this may be due to malingering or factitious disorder, which is a psychiatric disorder. Demographics affected by factitious hypoglycemia include women aged 30–40, particularly those with diabetes, relatives with diabetes, healthcare workers, or those with history of a psychiatric disorder. The classic way to identify surreptitious insulin use is through blood work revealing high insulin levels with low C-peptide and proinsulin. Alcohol misuse
The production of glucose is blocked by alcohol. In those who misuse alcohol, hypoglycemia may be brought on by a several-day alcohol binge associated with little to no food intake. The cause of hypoglycemia is multifactorial, where glycogen becomes depleted in a state of starvation. Glycogen stores are then unable to be repleted due to the lack of food intake, all compounded the inhibition of glucose production by alcohol. Hormone deficiency
Children with primary adrenal failure, also called Addisons disease, may experience hypoglycemia after long periods of fasting.