Idiopathic
Trauma (recent or remote)
Intracranial hemorrhage (subdural, epidural, subarachnoid, intraparenchymal)
Structural CNS abnormalities
Vascular lesion (aneurysm, AVM)
Mass lesions (primary or metastatic neoplasms)
Degenerative neurologic diseases
Congenital brain abnormalities
Infection (meningitis, encephalitis, abscess)
Metabolic disturbances
Hypoglycemia or hyperglycemia
Hyponatremia or hypernatremia
Hyperosmolar states
Uremia
Hepatic failure
Hypocalcemia, hypomagnesemia (rare)
Toxins and drugs
Cocaine, lidocaine
Antidepressants
Theophylline
Alcohol withdrawal
Drug withdrawal
Eclampsia of pregnancy (may occur up to 8wks postpartum)
Hypertensive encephalopathy
Anoxic-ischemic injury (cardiac arrest, severe hypoxemia)
Vascular lesion (aneurysm, AVM)
Mass lesions (primary or metastatic neoplasms)
Degenerative neurologic diseases
Congenital brain abnormalities
Hypoglycemia or hyperglycemia
Hyponatremia or hypernatremia
Hyperosmolar states
Uremia
Hepatic failure
Hypocalcemia, hypomagnesemia (rare)
Cocaine, lidocaine
Antidepressants
Theophylline
Alcohol withdrawal
Drug withdrawal
Epileptic seizure<unk> 
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
Barbiturate withdrawal
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)<unk> 
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
Barbiturate withdrawal
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)
First-time seizure
Idiopathic
Febrile seizure
Trauma 
Transient ischemic attack
Intracranial hemorrhage 
Psychogenic nonepileptic seizure
Structural CNS abnormalities