DefinitionNitric acid is a poisonous clear-to-yellow colored liquid. This article discusses poisoning from swallowing or breathing in nitric acid.This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.Poisonous IngredientNitric acidWhere FoundFertilizersSubstances used to clean metals (such as gun barrels)Note: This list may not be all inclusive.SymptomsSymptoms from swallowing nitric acid may include:Abdominal pain- severeBurns to skin or mouthFeverMouth pain - severeRapid drop in blood pressureThroat swelling, which leads to breathing difficultyThroat pain - severeVomiting, bloodySymptoms from breathi