Browse our Health Library to learn about treatments, conditions, and how Cedars-Sinai can support your healthcare needs.
Rabies is a viral infection that attacks the nervous system. Once symptoms develop, it is often fatal. But a rabies vaccine, or a series of vaccines, given soon after contact with an animal infected with rabies can prevent the illness.
X-rays are a kind of imaging test that provides your healthcare provider with information about structures inside the body. These tests expose children to low doses of radiation.
Rathke cleft cysts are noncancerous fluid-filled growths that develop between the parts of the pituitary gland at the base of the brain. They develop while a fetus is growing in the womb. A Rathke cleft cyst develops from a piece of the ...
Reactive arthritis is a type of arthritis that occurs due to an infection. Arthritis is when joints become inflamed and painful. Reactive arthritis is not contagious. It's also known as Reiter's Syndrome. It mostly affects men ages 20 to...
If the rectum drops out of its normal place within the body and pushes out of the anal opening, the condition is called rectal prolapse.
Some people with epilepsy will have or eventually develop refractory epilepsy. This means that medicines don't work well, or at all, to control the seizures.
Relapsing-remitting multiple sclerosis (MS) is a type of multiple sclerosis that causes flare-ups with periods of remission in between. Most people diagnosed with MS start off with this type.
Renal vascular disease affects the blood flow into and out of the kidneys. It may cause kidney damage, kidney failure, and high blood pressure.
Respiratory distress syndrome (RDS) is a common problem in premature babies. It causes babies to need extra oxygen and help with breathing.
RSV is a viral illness that causes symptoms such as trouble breathing. It’s the most common cause of inflammation of the small airways in the lungs (bronchiolitis) and pneumonia in babies.
Restless legs syndrome is a sleep disorder that causes creepy, crawly feelings in your legs. This often happens when you are trying to go to sleep or have been sitting for a long time.
Restrictive cardiomyopathy, or RCM, is when the chambers of the heart become stiffer over time. Though the heart is able to squeeze well, it is not able to relax between beats normally. This makes it harder for the heart to fill with ...
Retinitis pigmentosa is the name of a group of eye diseases that are passed down in families. All of them affect the retina. All of the diseases cause a slow but sure decline in eyesight.
Retinoblastoma is a rare cancer of the retina of the eye. The retina is in the back of the eye. It’s the part of the eye that receives light. Retinoblastoma is the most common tumor affecting the eye in children. It almost always occurs ...
Retinopathy of prematurity is an eye problem that happens to premature babies. The retina lines the back of the eye. It receives light as it comes through the pupil. From there, the optic nerve sends signals to the brain. Retinopathy of ...
When a replacement joint wears out, loosens or develops a problem, it can be resurfaced or replaced in a joint revision operation. Using regular X-ray examinations, the orthopedic surgeon can detect and monitor any changes, and plan for ...
Reye syndrome is a rare but very serious illness that causes brain swelling and liver damage. It can also affect all of the body’s organs.
Rh disease occurs during pregnancy. It happens when the Rh factors in the mom’s and baby’s blood don’t match. It may also happen if the mom and baby have different blood types.
Rhabdomyosarcoma is a type of cancer. It starts in cells that grow into skeletal muscle cells. The cells are called rhabdomyoblasts. Skeletal muscles control all of a person’s voluntary muscle movements. The cancer is most common in ...
Rheumatic fever is a complex disease that affects the joints, skin, heart, blood vessels, and brain. It occurs mainly in children between the ages of 5 to 15.
Rheumatic fever is a complication of a strep throat. About three people out of every 10 who have a strep throat infection develop rheumatic fever. One common and potentially dangerous effect of rheumatic fever is damage to the valves of ...
Rheumatic heart disease is a condition where the heart valves have been permanently damaged by rheumatic fever.
Rheumatic heart disease is a condition that causes permanent damage to the heart valves.
Rheumatoid arthritis (RA) is a long-term (chronic) disease that causes inflammation of the joints. The inflammation can be so severe that it affects how the joints and other parts of the body look and function.
Rheumatoid vasculitis is a condition that causes blood vessels to be inflamed. It happens in some people who have had rheumatoid arthritis (RA) for a long time.
Rhinitis is when a reaction occurs that causes a stuffy nose, runny nose, sneezing, and itching. Most types of rhinitis are caused by an inflammation. Here's what you need to know.
Right bundle branch block comes from a problem with the heart's ability to send electrical signals. It usually doesn't cause symptoms unless you have some other heart condition.
Ringworm is a type of skin infection cause by a fungus. It looks like a red skin rash that forms a ring around normal-looking skin. Ringworm can be of several types.
Anemia is when your blood has lower levels of red blood cells, or your red blood cells don't have enough of the protein hemoglobin. Hemoglobin carries oxygen, which is sent around the body through blood. Anemia may occur after ...
Rocky Mountain spotted fever (RMSF) is a bacterial infection. It’s spread by the bite of an infected tick.