Conditions
Medulloblastoma
Medulloblastoma is a fast-growing, cancerous (malignant) brain tumor that starts in the cerebellum, the part of the brain controlling balance and coordination. It is…
Medullary Thyroid Cancer
Medullary thyroid cancer (MTC) is a rare type of cancer that starts in specific cells of the thyroid gland called C cells. These cells…
Mediastinal Tumor
A mediastinal tumor is an abnormal growth that forms in the mediastinum, the central space in your chest located between your lungs. This vital…
Retinoblastoma
Retinoblastoma is a rare type of eye cancer that typically affects young children, usually under 5 years old. It starts in the retina, the…
Retinitis Pigmentosa
Retinitis pigmentosa (RP) is a group of rare, inherited eye diseases that cause progressive vision loss. It damages the retina, the light-sensitive tissue at…
Retinal Vein Occlusion
Retinal vein occlusion (RVO) happens when a small vein in your eye's retina becomes blocked, preventing blood from draining properly. This blockage causes blood…
Retinal Hemorrhage
Retinal hemorrhage is bleeding that occurs in the retina, the light-sensitive tissue at the back of your eye. This bleeding can range from tiny…
Refractive Lens Exchange
Refractive Lens Exchange (RLE) is a surgical procedure that replaces your eye's natural lens with an artificial intraocular lens (IOL). It aims to correct…
Recurrent Corneal Erosion
Recurrent corneal erosion (RCE) is a painful eye condition where the outer layer of your eye's clear front surface, called the cornea, repeatedly peels…
Reactive Airway Disease
Reactive airway disease is a general term describing conditions that cause your airways to narrow and make breathing difficult. It is not a formal…
REM Sleep Behavior Disorder
REM sleep behavior disorder (RBD) is a sleep condition where you physically act out vivid, often unpleasant dreams during the rapid eye movement (REM)…
Quadriceps Tendon Tear
A quadriceps tendon tear is an injury where the large tendon above your kneecap (patella) is damaged. This tendon connects your thigh muscles to…
Pyloric Stenosis
Pyloric stenosis is an uncommon condition in infants where the muscle at the bottom of the stomach (pylorus) thickens, blocking food from entering the…
Pseudomyxoma Peritonei
Pseudomyxoma peritonei (PMP) is a rare, slow-growing condition where a jelly-like substance called mucin builds up in your abdomen. This usually happens when a…
Proctitis
Proctitis is inflammation of the lining of your rectum, the final section of your large intestine before the anus. This condition can cause discomfort,…
Prion Disease
Prion diseases are a group of rare, progressive, and fatal brain disorders that cause rapid damage to the brain. They are caused by abnormal…
Prinzmetal Angina
Prinzmetal angina is a rare type of chest pain (angina) caused by a sudden, temporary tightening (spasm) of an artery that supplies blood to…
Primary Aldosteronism
Primary aldosteronism is a condition where your adrenal glands, located above your kidneys, produce too much of a hormone called aldosterone. This excess hormone…
Presbyopia
Presbyopia is a common, age-related eye condition that makes it difficult to focus on close-up objects. It happens when the natural lens inside your…
Pott’s Puffy Tumor
Pott's Puffy Tumor is a rare but serious complication of a frontal sinus infection. It involves the spread of infection from the sinus to…
Pott’s Disease
Pott's disease is a serious form of tuberculosis (TB) that affects the spine. It occurs when the bacteria that cause TB spread from the…
Postprandial Hypotension
Postprandial hypotension is a sudden drop in blood pressure that happens within two hours after eating a meal. This condition can cause symptoms like…
Postpartum Preeclampsia
Postpartum preeclampsia is a rare but serious condition that causes high blood pressure (hypertension) and sometimes organ damage after childbirth. It typically develops within…
Portal Hypertension
Portal hypertension is a serious condition where blood pressure in the portal vein, which carries blood from your digestive organs to your liver, becomes…