Differential diagnosis of coma are :
-seizures
-carbon monoxide poisoning
-subdural hematoma
-hypoglycemia
-mass lesion such as brain stem compression
-meningitis
-encephalitis
-brainstem hemorrhage
-brainstem infarction
-subarachnoid hemorrhage
-intracerebral hemorrhage
-ischemic stroke
-anoxic brain injury
-trauma to the head
-myxedema
-heat stroke
-hypothermia
-hypercalcemia
-hyponatremia
-hypernatremia
-uremic encephalopathy
-hepatic encephalopathy
-alcohol intake
-opioids intake
-salicylates
-sedative
-antidepressant
-hyperglycemic hyperosmolar state
-diabetic ketoacidosis
-seizures
-carbon monoxide poisoning
-subdural hematoma
-hypoglycemia
-mass lesion such as brain stem compression
-meningitis
-encephalitis
-brainstem hemorrhage
-brainstem infarction
-subarachnoid hemorrhage
-intracerebral hemorrhage
-ischemic stroke
-anoxic brain injury
-trauma to the head
-myxedema
-heat stroke
-hypothermia
-hypercalcemia
-hyponatremia
-hypernatremia
-uremic encephalopathy
-hepatic encephalopathy
-alcohol intake
-opioids intake
-salicylates
-sedative
-antidepressant
-hyperglycemic hyperosmolar state
-diabetic ketoacidosis