Severe hypoglycaemia

High urgency
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Drop in blood glucose below 30 mg/dl. There are many causes, but the main ones are: an error in insulin administration, a coexisting disease, and an excess of glucose consumption with a low carbohydrate intake.

The most common symptoms are dizziness, tremors, sweating, tachycardia, tingling, confusion, changes in vision and reduced level of consciousness.

The diagnosis is made by analysing the concentration of glucose in a drop of blood taken from a fingertip.

In cases of severe hypoglycaemia with loss of consciousness, intravenous glucose may need to be given. Diabetics may have a medicine called glucagon, which can be given intramuscularly to raise blood glucose levels from the body's own reserves.

If you have diabetes, it is important that the people closest to you know what to do in the event of hypoglycaemia.

Bibliographic references
  1. D. Figuerola. Diabetes mellitus. Hipoglucemia. Farreras Rozman. Medicina Interna. Volumen II. Duodécima edición. 1920:1923.
  2. P. E. Cryer, S. N. Davis. Hipoglucemia. Harrison. Principios de Medicina Interna. Volumen II. Decimonovena edición. 2430:2433.
  3. MedlinePlus. Rockville. 2017. Hipoglucemia; [citado el 10 de julio de 2017]. Disponible en: https://medlineplus.gov/spanish/hypoglycemia.html
  4. UpToDate [Internet]. Waltham. 2017. Hypoglycemia in adults: Clinical manifestations, definition, and causes; [citado el 10 de julio de 2017]. Disponible en: http://www.uptodate.com/contents/hypoglycemia-in-adults-clinical-manifestations-definition-and-causes?source=search_result&search=hipoglucemia+severa&selectedTitle=2~150
Author
Dr. Oscar Garcia-Esquirol
Copyright
© TeckelMedical 2026

Symptoms

    Blood glucose levels at 50 mg/dl or less


    Blood glucose below 60 mg/dL


    Palpitations


    Diminished level of consciousness

Pre-hospital care recommendations

Consume fruit juice or sweet foods that raise blood sugar levels.
If you are disoriented, call the emergency services.