Toxic alcohols
Ethanol
Ethylene glycol
Methanol
Isopropyl alcohol
Benzodiazepines
Flunitrazepam (Rohypnol)
Gamma hydroxybutyrate (GHB)
Baclofen<unk> s
Opioids
Chloral hydrate
Ethanol
Ethylene glycol
Methanol
Isopropyl alcohol
Flunitrazepam (Rohypnol)
Epileptic seizure
First-time seizure
Seizure with known seizure disorder
Status epilepticus
Temporal lobe epilepsy
Non-compliance with anti-epileptic medications
Hyponatremia
INH toxicity
Non-epileptic seizure
Meningitis
Encephalitis
Brain abscess
Intracranial hemorrhage
Alcohol withdrawal
Benzodiazepine withdrawal<unk> 
Baclofen withdrawal
Metabolic abnormalities: hyponatremia, hypernatremia, hypocalcemia, hypomagnesemia, hypoglycemia, hyperglycemia, hepatic failure, uremia
Eclampsia
Neurocysticercosis
Posterior reversible encephalopathy syndrome
Impact seizure (head trauma)
Acute hydrocephalus
Arteriovenous malformation
Seizure with VP shunt
Toxic ingestion (amphetamines, anticholinergics, cocaine, INH, organophosphates, TCA, salicylates, lithium, phenothiazines, bupropion, camphor, clozapine, cyclosporine, fluoroquinolones, imipenem, lead, lidocaine, metronidazole, synthetic cannabinoids, theophylline, Starfruit)
Psychogenic nonepileptic seizure (pseudoseizure)
Intracranial mass
Syncope
Hyperventilation syndrome
Migraine headache
Movement disorders
Narcolepsy/cataplexy
Post-hypoxic myoclonus (Status myoclonicus)
First-time seizure
Seizure with known seizure disorder
Status epilepticus
Temporal lobe epilepsy
Non-compliance with anti-epileptic medications
Hyponatremia
INH toxicity
Meningitis
Encephalitis
Brain abscess
Intracranial hemorrhage
Alcohol withdrawal
Benzodiazepine withdrawal<unk> 
Baclofen withdrawal
Metabolic abnormalities: hyponatremia, hypernatremia, hypocalcemia, hypomagnesemia, hypoglycemia, hyperglycemia, hepatic failure, uremia
Eclampsia
Neurocysticercosis
Posterior reversible encephalopathy syndrome
Impact seizure (head trauma)
Acute hydrocephalus
Arteriovenous malformation
Seizure with VP shunt
Toxic ingestion (amphetamines, anticholinergics, cocaine, INH, organophosphates, TCA, salicylates, lithium, phenothiazines, bupropion, camphor, clozapine, cyclosporine, fluoroquinolones, imipenem, lead, lidocaine, metronidazole, synthetic cannabinoids, theophylline, Starfruit)
Psychogenic nonepileptic seizure (pseudoseizure)
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
Catatonia
Excited delirium
Malingering
Barbiturate withdrawal
Toxic alcohols
Caffeine withdrawal
Ethanol
Alcohol withdrawal
Ethylene glycol
Cocaine withdrawal
Methanol