Diagnosaurus
- Nail disorders, miscellaneous
- Nail disorders, onycholysis
- Nails, discolored or thick
- Nails, distorted
- Nasal congestion
- Nasal deformity
- Nasal polyps
- Nasal septum perforation
- Nasal tumors
- Nausea
- Neck mass
- Neck pain
- Neck stiffness
- Neurogenic arthropathy
- Neuropathy, peripheral (mononeuropathy)
- Neuropathy, peripheral (polyneuropathy)
- Neutropenia
- Neutropenic fever
- Neutrophilia
- Nipple discharge
- Nipple discharge, milky
- Nipple or areolar lesions
- Nocturia
- Nocturnal dyspnea
- Nocturnal leg cramps
- Nodules, subcutaneous
- Nodules, thyroid
- Nodules and papules
- Nonpalpable purpura
- Normocytic anemia
- Nosebleed
- Nosocomial fever
- Nystagmus