Recurrent episodes of hypoglycemia may lead to lowering of the blood glucose at which stress responses (i.e., glucagon secretion, stimulation of the sympathetic nervous system, and release of catecholamine, growth hormone, and cortisol) are triggered.[10]Heller SR, Peyrot M, Oates SK, et al. Hypoglycemia in patient with type 2 diabetes treated with insulin: it can happen. BMJ Open Diabetes Res Care. 2020 Jun;8(1):e001194.
https://drc.bmj.com/content/8/1/e001194
http://www.ncbi.nlm.nih.gov/pubmed/32546549?tool=bestpractice.com
[41]McCrimmon RJ, Sherwin RS. Hypoglycemia in type 1 diabetes. Diabetes. 2010 Oct;59(10):2333-9.
https://diabetesjournals.org/diabetes/article/59/10/2333/16691/Hypoglycemia-in-Type-1-Diabetes
http://www.ncbi.nlm.nih.gov/pubmed/20876723?tool=bestpractice.com
[114]Amiel SA. The consequences of hypoglycaemia. Diabetologia. 2021 May;64(5):963-70.
https://link.springer.com/article/10.1007/s00125-020-05366-3
http://www.ncbi.nlm.nih.gov/pubmed/33550443?tool=bestpractice.com
Alteration of these mechanisms leads to impaired awareness of hypoglycemia (i.e., the normal warning symptoms of hypoglycemia occur at progressively lower blood glucose levels), which increases the risk of severe hypoglycemia.[7]Nakhleh A, Shehadeh N. Hypoglycemia in diabetes: an update on pathophysiology, treatment, and prevention. World J Diabetes. 2021 Dec 15;12(12):2036-49.
https://www.wjgnet.com/1948-9358/full/v12/i12/2036.htm
http://www.ncbi.nlm.nih.gov/pubmed/35047118?tool=bestpractice.com
[10]Heller SR, Peyrot M, Oates SK, et al. Hypoglycemia in patient with type 2 diabetes treated with insulin: it can happen. BMJ Open Diabetes Res Care. 2020 Jun;8(1):e001194.
https://drc.bmj.com/content/8/1/e001194
http://www.ncbi.nlm.nih.gov/pubmed/32546549?tool=bestpractice.com
[32]McGibbon A, Richardson C, Hernandez C, et al; Canadian Diabetes Association Clinical Practice Guidelines Expert Committee. Pharmacotherapy in type 1 diabetes. Can J Diabetes. 2013 Apr;37(1 suppl):S56-60.
https://www.canadianjournalofdiabetes.com/article/S1499-2671(13)00021-X/fulltext
http://www.ncbi.nlm.nih.gov/pubmed/24070964?tool=bestpractice.com
Avoidance of hypoglycemia (e.g., by short-term relaxation of glycemic targets) in these patients improves counterregulatory hormone response and awareness of hypoglycemia, helping to reduce the risk of recurrence.[1]Abraham MB, Karges B, Dovc K, et al. ISPAD Clinical Practice Consensus Guidelines 2022: assessment and management of hypoglycemia in children and adolescents with diabetes. Pediatr Diabetes. 2022 Dec;23(8):1322-40.
https://onlinelibrary.wiley.com/doi/10.1111/pedi.13443
http://www.ncbi.nlm.nih.gov/pubmed/36537534?tool=bestpractice.com
[3]American Diabetes Association. Standards of care in diabetes - 2025. Diabetes care. 2025. Jan 1; 48(Suppl 1):S1-343.
https://diabetesjournals.org/care/issue/48/Supplement_1
Severe and/or recurrent hypoglycemic episodes are associated with increased mortality, both in the acute setting and long term.[115]McCoy RG, Van Houten HK, Ziegenfuss JY, et al. Increased mortality of patients with diabetes reporting severe hypoglycemia. Diabetes Care. 2012 Sep;35(9):1897-901.
https://diabetesjournals.org/care/article/35/9/1897/38354/Increased-Mortality-of-Patients-With-Diabetes
http://www.ncbi.nlm.nih.gov/pubmed/22699297?tool=bestpractice.com
[116]Skrivarhaug T, Bangstad HJ, Stene LC, et al. Long-term mortality in a nationwide cohort of childhood-onset type 1 diabetic patients in Norway. Diabetologia. 2006 Feb;49(2):298-305.
https://link.springer.com/article/10.1007/s00125-005-0082-6
http://www.ncbi.nlm.nih.gov/pubmed/16365724?tool=bestpractice.com
One retrospective study showed that self-reported episodes of severe hypoglycemia are associated with a 3.4-fold increase in 5-year mortality.[115]McCoy RG, Van Houten HK, Ziegenfuss JY, et al. Increased mortality of patients with diabetes reporting severe hypoglycemia. Diabetes Care. 2012 Sep;35(9):1897-901.
https://diabetesjournals.org/care/article/35/9/1897/38354/Increased-Mortality-of-Patients-With-Diabetes
http://www.ncbi.nlm.nih.gov/pubmed/22699297?tool=bestpractice.com
However, it is unclear from the evidence whether many of the complications of hypoglycemia that can increase mortality are a direct result of hypoglycemia itself, or whether hypoglycemia is a marker of patients who are more at risk of complications.