Articles In This Section
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A to Z: Pyogenic Arthritis (Septic Arthritis)
Pyogenic, or septic, arthritis is a serious and painful infection of a joint. It's most common in children from birth to age 3 and older adults.
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A to Z: Postoperative Infection
Learn about postoperative infections, which are any kind of infections that occur following a surgical procedure.
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A to Z: Postoperative Pain
Postoperative pain is pain or discomfort after surgery.
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A to Z: Precocious Puberty
Learn about hormonal disorders and conditions that can affect childhood sexual development.
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A to Z: Procidentia
Learn about conditions that affect the rectum, anus, and digestive system.
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A to Z: Pseudotumor Cerebri
See: Hypertension, Intracranial.
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A to Z: Psychosis
Learn about symptoms of mental illness and conditions that affect thinking and behavior.
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A to Z: Pulmonary Artery Sling
With this condition, an artery carrying blood from the heart to the lungs can form a sling around the windpipe and block air flow. Learn more about it here.
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A to Z: Pulmonic Valvular Stenosis
Learn about this congenital heart defect that alters blood flow through the heart and lungs and can affect a child's growth and circulation.
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A to Z: Purpura, Allergic
See: Henoch-Schönlein Purpura (HSP).
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A to Z: Purpura, Anaphylactoid
See: Henoch-Schönlein Purpura (HSP).
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A to Z: Purpura, Henoch-Schönlein (HSP)
See: Henoch-Schönlein Purpura (HSP).
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A to Z: Purpura, Schönlein-Henoch
See: Henoch-Schönlein Purpura (HSP).
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A to Z: Pyelonephritis
Learn more about pyelonephritis and how it's treated.
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A to Z: Pyloric Stenosis
Pyloric stenosis is a condition that happens during infancy, and affects the lower part of the stomach.
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A to Z: Phenylketonuria
In this genetic disorder, the body cannot break down the amino acid phenylalanine, which then builds up in the system and affects the brain. Learn more.
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A to Z: Polymyositis
Polymyositis is an uncommon disease that causes muscle weakness, pain, and inflammation. It usually affects adults.
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A to Z: Polyarteritis Nodosa
Learn about polyarteritis nodosa (PAN), a rare disease causing inflammation of the blood vessels.
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A to Z: Pneumonia, Bacterial
Bacterial pneumonia is a lung infection caused by bacteria (such as staph or strep).
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A to Z: Pityriasis Rosea
Learn about rashes and other conditions that affect the skin.
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A to Z: Pituitary Dwarfism
Pituitary dwarfism is a condition in which the pituitary gland does not make enough growth hormone, resulting in a child's slow growth pattern and unusually small stature.
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A to Z: Pinkeye (Conjunctivitis)
Pinkeye (conjunctivitis) is an inflammation of the conjunctiva, the tissue covering the white part of the eye and the inner surface of the eyelid.
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A to Z: Pilonidal Cyst
Learn more about skin infections, cysts, and abscesses.
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A to Z: Phimosis
Learn about phimosis, a condition that affects the penis and foreskin in uncircumcised males.
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A to Z: Pervasive Developmental Disorder (PDD)
Learn more about this type of autism that can impair social skills, delay speech, and cause repetitive behaviors.
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A to Z: Peritonsillar Abscess
A peritonsillar abscess is an area of pus-filled tissue at the back of the mouth, next to one of the tonsils.
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A to Z: Peritonitis
Learn more about bacterial infections, problems of the gastrointestinal tract, and complications related to infections and diseases of the abdominal organs.
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A to Z: Pericarditis
Learn about complications of infections and conditions that affect the heart.
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A to Z: Periarteritis Nodosa
See Polyarteritis Nodosa.
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A to Z: Peptic Ulcers
Peptic ulcers are painful sores in the lining of the stomach or upper part of the small intestine.
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A to Z: Patent Ductus Arteriosus (PDA)
Learn about heart conditions that affect newborn and premature babies.
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A to Z: Paroxysmal Supraventricular Tachycardia (PSVT)
Paroxysmal supraventricular tachycardia (PSVT) is a type of arrhythmia in which the heart beats very rapidly.
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A to Z: Paronychia
Paronychia, an infection of the skin around a fingernail or toenail, usually isn't a serious problem.
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A to Z: Paresthesia
Parathesia is a burning, prickling, itching, or tingling "pins and needles" skin sensation. Anyone who has had a foot "fall asleep" has experienced temporary paresthesia.
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A to Z: Paralytic Ileus
Learn about intestinal blockages and conditions that affect the digestive tract.
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A to Z: Panniculitis, Popsicle
Learn about causes of skin inflammation and conditions that affect infants and young children.
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A to Z: Palpitations
Learn about arrhythmias and conditions that affect the heart and heartbeat.
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A to Z: Panarteritis Nodosa
See Polyarteritis Nodosa.
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A to Z: Pancreatitis
Learn more about pancreatitis, an inflammation of the pancreas that can cause severe belly pain and vomiting.
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A to Z: Panic Disorder
Learn about panic disorder, an anxiety disorder in which a person experiences recurrent feelings of intense fear when there's no real threat or danger.
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A to Z: Primitive Neuroectodermal Tumor (PNET)
Primitive neuroectodermal tumors, or PNETs, are tumors that can happen anywhere in the brain or spine.
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A to Z: Pott’s Fracture
Bimalleolar fracture, Pott's fracture, medial malleolus, lateral malleolus, ankle, ankle fracture, broken ankle, tibia, fibula, shinbone, operative fixation, surgery, malleoli
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A to Z: Pectus Excavatum
Learn more about pectus excavatum, commonly called sunken chest.
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A to Z: Pectus Carinatum
Learn more about pectus carinatum, commonly called pigeon chest.
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A to Z: Patellar Dislocation
Patellar dislocation happens when the patella (kneecap) slips out of its normal position.
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A to Z: Pneumonia, Mycoplasma
Mycoplasma pneumonia, also called walking pneumonia or atypical pneumonia, is a mild lung infection caused by bacteria.
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A to Z: Pneumonitis
Pneumonitis is a general term for inflammation of the lungs.
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A to Z: Pneumonia, Viral
Learn about viral pneumonia, a lung infection caused by a virus.