Hypoxic encephalopathy
Acute toxic-metabolic encephalopathy (Delirium)
Hypoglycemia
Hyperosmolar state (e.g., hyperglycemia)
Electrolyte Abnormalities (hypernatremia or hyponatremia, hypercalcemia)
Organ system failure
Hepatic Encephalopathy
Uremia/Renal Failure
Endocrine (Addison's disease, Cushing syndrome, hypothyroidism, myxedema coma, thyroid storm)
Hypoxia
CO2 narcosis
Hypertensive Encephalopathy
Toxins
TTP / Thrombotic thrombocytopenic purpura
Alcohol withdrawal
Drug reactions (NMS, Serotonin Syndrome)
Environmental causes
Hypothermia
Hyperthermia
Deficiency state
Wernicke encephalopathy
Subacute Combined Degeneration of Spinal Cord (B12 deficiency)
Vitamin D Deficiency
Zinc Deficiency
Sepsis
Osmotic demyelination syndrome (central pontine myelinolysis)
Limbic encephalitis
Hypoglycemia
Hyperosmolar state (e.g., hyperglycemia)
Electrolyte Abnormalities (hypernatremia or hyponatremia, hypercalcemia)
Organ system failure
Hepatic Encephalopathy
Uremia/Renal Failure
Endocrine (Addison's disease, Cushing syndrome, hypothyroidism, myxedema coma, thyroid storm)
Hypoxia
CO2 narcosis
Hypothermia
Hyperthermia
Wernicke encephalopathy
Subacute Combined Degeneration of Spinal Cord (B12 deficiency)
Vitamin D Deficiency
Zinc Deficiency
Direct CNS trauma
Diffuse axonal injury
Subdural/epidural hematoma
Vascular disease
Intraparenchymal hemorrhage
SAH
Stroke
Hemispheric, brainstem
CNS infections
Encephalitis
Anti-NMDA receptor encephalitis
Meningitis
Neoplasms
Paraneoplastic Limbic encephalitis
Malignant Meningitis
Pancreatic Insulinoma
Seizures
Nonconvulsive status epilepticus
Postictal state
Dementia
Alzheimer's
Lewy Body Dementia
Frontotemporal Dementia
Diffuse axonal injury
Subdural/epidural hematoma
Intraparenchymal hemorrhage
Hemispheric, brainstem
Encephalitis
Anti-NMDA receptor encephalitis
Meningitis
Paraneoplastic Limbic encephalitis
Malignant Meningitis
Pancreatic Insulinoma
Nonconvulsive status epilepticus
Postictal state
Alzheimer's
Lewy Body Dementia
Frontotemporal Dementia
Acute psychosis<unk> 
Excited delirium
Malingering
Catatonia
Hypoxic encephalopathy
Dysphonia
Acute toxic-metabolic encephalopathy 
Opsoclonus
Hypoglycemia
Tremor
Hyperosmolar state 