Causes of anion-gap acidosis

MUDPILES

Methanol
Uremia
DKA
Paraldehydes (used to be an antiseizure med)/Paint sniffing
INH (triad: metabolic acidosis, seizure, coma), iron, ibuprofen, inborn error of metab
Lactic Acidosis
Ethanol, Ethylene glycol
Salicylates

Also see Osmolar Gap