| Abbreviation | Definition |
|---|---|
| N | Nipple |
| N&M | Nerves and muscles |
| N&T | Nose and throat |
| N/V/D/C | Nausea/Vomiting/Diarrhea/Constipation |
| NA | Nasal Augment |
| NA | No Abnormalities |
| NA | Non Activin |
| NA | NorAdrenaline |
| NA | Normally Aspirated |
| NA | Not Admitted |
| NAA | No apparent abnormalities |
| NABS | Normo-Active Bowel Sounds |
| NAC | Neuro Associative Conditioning |
| NAD | No Active Disease |
| NAD | No Acute Distress |
| NAD | No Appreciable Disorders |
| NAD | Nothing Abnormal Detected |
| NADA | National Aquaculture Drug Application |
| NAEMSP | National Association of Emergency Medicine Services Physicians |
| NAEP | North American Education Program (on managing pain and sleep issues in multiple sclerosis, a joint program of the MS Society of Canada and the National MS Society (USA)) |