Definition of Consciousness - decreased:

Decreased consciousness is reduced alertness or awareness.

Considerations:

A persistent coma is called vegetative state.

Common Causes:

Many conditions can cause decreased consciousness, including:

• Alcohol intoxication
• Drug intoxication (particularly opiates, narcotics, sedatives, and anti-anxiety or seizure medications)
• Arrhythmia
• Brain disorders
• Central nervous system diseases
• Lack of oxygen (hypoxia)
• Abnormal blood sugars (diabetic coma)
• Electrolyte or mineral imbalance
• Exposure to heavy metals or hydrocarbons
• Extreme fatigue or sleep deprivation
• Ketoacidosis
• Head trauma
• Heart failure
• Hypoglycemia (low blood sugar)
• Increased carbon dioxide levels (hypercarbia) often seen in emphysema
• Infection
• Low blood pressure (hypotension)
• Metabolic disorders
• Thyroid or adrenal gland disorders
• Seizures such as those related to epilepsy
• Shock
• Stroke