Editing PD (section)

===Medicine===
* [[Paleolithic diet]], a diet based on presumed ancient diets
* [[Panic disorder]], a condition with excessive fear or anxiety
* [[Parkinson's disease]], a degenerative neurological condition
* [[Paroxysmal dyskinesia]], a group of movement disorders
* [[Pediatric dentistry]], mouth health care and tooth repair for children
* [[Peritoneal dialysis]], a way to filter the blood when the kidneys are not working well
* [[Personality disorder]], any of various psychiatric problems
* [[Peyronie's disease]], a connective tissue disorder involving the growth of fibrous plaques in the soft tissue of the penis
* [[Pharmacodynamics]], the study of how a drug affects an organism
* [[Phenyldichloroarsine]], a blister agent and vomiting agent
* [[Polydipsia]], excessive thirst
* [[Progressive disease]], a disease that continues to worsen and often has no proven total cure
* [[Psychotic depression]], a major depressive episode that is accompanied by psychotic symptoms
* [[Pupillary distance]], in optometry