- Porphine
- Porphobilinogen
- Porphyra
- Porphyran
- Porphyria
- Porphyria cutanea tarda
- Porphyrin
- Porphyrinogen
- Porphyromonadaceae
- Porphyromonas
- Port wine stain
- Port-wine stain
- Porta hepatis
- Portable ultrasound
- Portacaval shunt
- Portal hypertension
- Portal triad
- Portal vein
- Portal vein embolization
- Portal vein thrombosis
- Portal venous pressure
- Portal venous system
- Portography
- Portopulmonary hypertension
- Posaconazole
- Position effect
- Positional asphyxia
- Positive Behavior Support
- Positive affectivity
- Positive allosteric modulators
- Positive and negative predictive values
- Positive end-expiratory pressure
- Positive illusions
- Positive ion
- Positive mental attitude
- Positive psychology
- Positive psychotherapy
- Positivity effect
- Positron
- Positron emission tomography
- Positron-emission tomography
- Posizolid
- Post and core
- Post concussion syndrome
- Post dural puncture headache
- Post exposure prophylaxis
- Post hoc analysis
- Post mortem interval
- Post nasal drip
- Post tetanic potentiation
- Post traumatic amnesia
- Post-COVID
- Post-abortion care
- Post-acute withdrawal syndrome
- Post-cardiac arrest syndrome
- Post-dural-puncture headache
- Post-exertional malaise
- Post-intensive care syndrome
- Post-kala-azar dermal leishmaniasis
- Post-lingual deafness
- Post-nasal drip
- Post-polio syndrome
- Post-stroke depression
- Post-transcriptional modification
- Post-transcriptional regulation
- Post-transfusion purpura
- Post-translational modifications
- Post-translational regulation
- Post-transplant lymphoproliferative disorder
- Post-traumatic arthritis
- Post-traumatic epilepsy
- Post-traumatic growth
- Post-vasectomy pain syndrome
- Post-void dribbling
- Postcardiotomy syndrome
- Postcentral gyrus
- Postcentral sulcus
- Postcholecystectomy syndrome
- Postcoital bleeding
- Postcoital test
- Postdrome
- Postencephalitic parkinsonism
- Posterior auricular artery
- Posterior auricular muscle
- Posterior capsular opacification
- Posterior cardinal vein
- Posterior cerebral artery
- Posterior chamber
- Posterior cingulate
- Posterior cingulate cortex
- Posterior circulation infarct
- Posterior clinoid process
- Posterior clinoid processes
- Posterior column
- Posterior commissure
- Posterior communicating artery
- Posterior compartment of the forearm
- Posterior compartment of the leg
- Posterior cord syndrome
- Posterior cortical atrophy
- Posterior cranial fossa
- Posterior cricoarytenoid muscle
- Posterior cruciate ligament
- Posterior ethmoidal foramen
- Posterior fontanelle
- Posterior funiculus
- Posterior humeral circumflex artery
- Posterior inferior cerebellar artery
- Posterior interosseous artery
- Posterior interosseous nerve
- Posterior interventricular artery
- Posterior ischemic optic neuropathy
- Posterior lacrimal crest
- Posterior lobe
- Posterior longitudinal ligament
- Posterior meningeal artery
- Posterior nasal spine
- Posterior nucleus
- Posterior parietal cortex
- Posterior pituitary
- Posterior pole
- Posterior predictive distribution
- Posterior reversible encephalopathy syndrome
- Posterior sacroiliac ligament
- Posterior segment
- Posterior spinal artery
- Posterior superior iliac spine
- Posterior talofibular ligament
- Posterior tibial artery
- Posterior tibial tendon
- Posterior tibial tendon dysfunction
- Posterior tibial vein
- Posterior triangle of the neck
- Posterior urethral valve
- Posterior urethral valves
- Posterior vitreous detachment
- Postganglionic nerve fibers
- Postherpetic neuralgia
- Posthitis
- Posthypnotic amnesia
- Postictal state
- Postinflammatory hyperpigmentation
- Postmarketing surveillance
- Postmenopause
- Postnatal depression
- Postoperative cognitive dysfunction
- Postoperative fever
- Postoperative ileus
- Postoperative nausea and vomiting
- Postorgasmic illness syndrome