- Pacemaker implantation
- Paget's disease
- Pain, shoulder
- Painkillers, ibuprofen
- Painkillers, paracetamol
- Palpitations
- Pancolitis
- Pancreas transplant
- Pancreatic cancer
- Pancreatitis, acute
- Pancreatitis, chronic
- Pandemic flu
- Panic disorder
- Panniculitis
- Paracetamol
- Paraesthesia
- Paralysis
- Parkinson's disease
- Parvovirus B19
- PCOS
- Pelvic inflammatory disease
- Pemphigus vulgaris
- Penicillin
- Penile cancer
- Peptic ulcer
- Perforated eardrum
- Pericarditis
- Periods
- Periods, absent
- Periods, heavy
- Periods, irregular
- Periods, painful
- Peripheral arterial disease
- Peripheral neuropathy
- Peritonitis
- Peritonsillar abscess
- Pernicious anaemia
- Persistent vegetative state
- Personality disorder
- Pertussis
- PET scan
- Pharyngitis
- Phenylketonuria
- Phobias
- Phosphate test
- Physiotherapy
- PID
- Piercing
- Piles (haemorrhoids)
- Pilonidal sinus
- Pins and needles
- Pityriasis rosea
- Plantar fasciitis
- Plasma products
- Plastic surgery
- Pleurisy
- Pneumococcal infections
- Pneumococcal vaccination
- Pneumonia
- Poisoning
- Polio and post polio syndrome
- Polipteal cyst
- Polycystic kidney disease, autosomal dominant (ADPKD)
- Polycystic kidney disease, autosomal recessive (ARPKD)
- Polycystic ovary syndrome
- Polymyalgia rheumatica
- Polyps, nose
- Port wine stain
- Positron emission tomography
- Post-mortem
- Post polio syndrome
- Post-traumatic stress disorder (PTSD)
- Postherpetic neuralgia
- Postnatal depression
- Potassium test
- Prader-Willi syndrome
- Pre-eclampsia
- Preconception
- Pregnancy
- Pregnancy care
- Premature ejaculation
- Premenstrual syndrome
- Preoperative tests
- Pressure ulcers
- Priapism
- Prickly heat
- Primary biliary cirrhosis
- Primary peritoneal cancer (PPC)
- Prion disease
- Progestogen-only pill
- Progressive supranuclear palsy
- Prolapse of the uterus
- Prolapsed disc
- Prostate cancer
- Prostate disease
- Prostate enlargement
- Prostate, transurethral resection of
- Prostatitis
- Pruritus ani
- Psoriasis
- Psoriatic arthritis
- PSP
- Psychiatry
- Psychosis
- Psychotherapy
- Psychotic episodes
- Ptosis
- Puberty
- Pubic lice
- Pulmonary embolism
- Pulmonary fibrosis (idiopathic)
- Pulmonary hypertension
- Pyelonephritis