A normal-anion-gap metabolic acidosis occurs in patients with-
Alkali can be lost from the gastrointestinal tract from diarrhea or from the kidneys (renal tubular acidosis, A). In these disorders, reciprocal changes in and result in a normal anion gap (AG). * In pure non-AG acidosis, therefore, the increase in above the normal value approximates the decrease in . 
Diarrhoea
Diabetic ketoacidosis
Methyl alcohol poisoning
Acute renal failure
Fluid and electrolytes