Coma: Symptoms & Signs

Medically Reviewed on 12/3/2019

A coma is a term that refers to a state of deep consciousness from which a person cannot be aroused. It is not a medical condition in itself.

Signs and symptoms of coma include

The severity of these characteristic symptoms is the basis for a grading scale that doctors use to determine the extent or severity of a coma.

Causes of coma

A number of different conditions including head trauma, stroke, lack of oxygen, hypoglycemia, drug or alcohol intoxication, bleeding into the brain, disease such as uncontrolled diabetes, poisoning, severe infection, or numerous other causes can cause a coma.

Other coma symptoms and signs

  • Closed Eyes
  • Irregular Breathing
  • Lack of Response to Pain or Other Stimuli
  • Loss of Speech


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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.