Z
- Zaire ebolavirusSpecies of virus affecting humans and animals
- ZanamivirInfluenza medication
- ZangfuAncient Organs and pattern correspondences, theory by Traditional Chinese Medicine
- Zero balancingAlternative medicine devised by Frederick "Fritz" Smith in the 1970s
- ZidovudineAntiretroviral medication
- Zika feverInfectious disease caused by the Zika virus
- Zika virusSpecies of flavivirus
- Zinc deficiencyInsufficient body levels of zinc
- ZiprasidoneAntipsychotic medication
- Zollinger–Ellison syndromeCondition in which tumours stimulate excessive gastric acid production
- ZolpidemSleep medication
- ZoonosisInfection by a pathogen of non-human origin
- Zygomaticotemporal nerveThe zygomaticotemporal nerve (zygomaticotemporal branch, temporal branch) is a cutaneous (