Rabies Rabies is a deadly animal disease caused by a virus. It can happen in wild animals, including raccoons, skunks, bats and foxes, or in dogs, cats or farm animals. People get it from the bite of an infected animal. In people, symptoms of rabies include fever, headache and fatigue, then confusion, hallucinations and paralysis. Once […]
Radiation Emergencies Radiation is a type of energy. People are exposed to small amounts of radiation every day from sources such as sunlight. A radiation emergency would involve larger amounts of radiation and could be caused by Dirty bombs – a mix of explosives with radioactive powder Fallout from a nuclear bomb Accidental release from a nuclear […]
Radiation Exposure Radiation is energy that travels in the form of waves or high-speed particles. It occurs naturally in sunlight. Man-made radiation is used in X-rays, nuclear weapons, nuclear power plants and cancer treatment. If you are exposed to small amounts of radiation over a long time, it raises your risk of cancer. It can also cause […]
Radiation Therapy Radiation therapy is a cancer treatment. It uses high doses of radiation to kill cancer cells and stop them from spreading. About half of all cancer patients receive it. The radiation may be external, from special machines, or internal, from radioactive substances that a doctor places inside your body. The type of radiation therapy you […]
Radon You can’t see radon. And you can’t smell it or taste it. But it may be a problem in your home. Radon comes from the natural breakdown of uranium in soil, rock, and water. Radon is the second leading cause of lung cancer in the United States. There are low levels of radon outdoors. Indoors, […]
Rare Diseases A rare disease is one that affects fewer than 200,000 people in the United States. There are nearly 7,000 rare diseases. More than 25 million Americans have one. Rare diseases May involve chronic illness, disability, and often premature death Often have no treatment or not very effective treatment Are frequently not diagnosed correctly Are often […]
Rashes A rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies. Certain genes can make people more likely to get […]
Raynaud’s Disease Raynaud’s disease is a rare disorder of the blood vessels, usually in the fingers and toes. It causes the blood vessels to narrow when you are cold or feeling stressed. When this happens, blood can’t get to the surface of the skin and the affected areas turn white and blue. When the blood flow returns, […]
Rectal Disorders The rectum is the lower part of your large intestine where your body stores stool. Problems with rectum are common. They include hemorrhoids, abscesses, incontinence and cancer. Many people are embarrassed to talk about rectal troubles. But seeing your doctor about problems in this area is important. This is especially true if you have pain […]
Refractive Errors The cornea and lens of your eye helps you focus. Refractive errors are vision problems that happen when the shape of the eye keeps you from focusing well. The cause could be the length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens. Four common refractive […]
Rehabilitation After a serious injury, illness or surgery, you may recover slowly. You may need to regain your strength, relearn skills or find new ways of doing things you did before. This process is rehabilitation. Rehabilitation often focuses on Physical therapy to help your strength, mobility and fitness Occupational therapy to help you with your daily […]
Reproductive Hazards Both the male and female reproductive systems play a role in pregnancy. Problems with these systems can affect fertility and the ability to have children. Something that affects reproductive health is called a reproductive hazard. Examples include: Radiation Metals such as lead and mercury Chemicals such as pesticides Cigarettes Some viruses Alcohol For men, a […]
Respiratory Failure Respiratory failure happens when not enough oxygen passes from your lungs into your blood. Your body’s organs, such as your heart and brain, need oxygen-rich blood to work well. Respiratory failure also can happen if your lungs can’t remove carbon dioxide (a waste gas) from your blood. Too much carbon dioxide in your blood can […]
Respiratory Syncytial Virus Infections Respiratory syncytial virus (RSV) causes mild, cold-like symptoms in adults and older healthy children. It can cause serious problems in young babies, including pneumonia and severe breathing problems. Premature babies and those with other health problems have the highest risk. A child with RSV may have a fever, stuffy nose, cough, and trouble breathing. Lab […]
Restless Legs Restless legs syndrome (RLS) causes a powerful urge to move your legs. Your legs become uncomfortable when you are lying down or sitting. Some people describe it as a creeping, crawling, tingling, or burning sensation. Moving makes your legs feel better, but not for long. RLS can make it hard to fall asleep and stay […]
Retinal Detachment The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. It provides the sharp, central vision needed for reading, driving, and seeing fine detail. A retinal detachment lifts or pulls the retina from its normal position. It can occur at any age, but […]
Retinal Disorders The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. In the center of this nerve tissue is the macula. It provides the sharp, central vision needed for reading, driving and seeing fine detail. Retinal disorders affect this vital tissue. They can affect […]
Rett Syndrome Rett syndrome is a rare genetic disease that causes developmental and nervous system problems, mostly in girls. It’s related to autism spectrum disorder. Babies with Rett syndrome seem to grow and develop normally at first. Between 3 months and 3 years of age, though, they stop developing and even lose some skills. Symptoms include Loss […]
Reye Syndrome Reye syndrome is a rare illness that can affect the blood, liver, and brain of someone who has recently had a viral infection. It always follows another illness. Although it mostly affects children and teens, anyone can get it. It can develop quickly and without warning. It is most common during flu season. Symptoms include […]
Rh Incompatibility There are four major blood types: A, B, O, and AB. The types are based on substances on the surface of the blood cells. Another blood type is called Rh. Rh factor is a protein on red blood cells. Most people are Rh-positive; they have Rh factor. Rh-negative people don’t have it. Rh factor is […]
Rheumatoid Arthritis Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, stiffness and loss of function in your joints. It can affect any joint but is common in the wrist and fingers. More women than men get rheumatoid arthritis. It often starts in middle age and is most common in older people. You might […]
Rickets Rickets causes soft, weak bones in children. It usually occurs when they do not get enough vitamin D, which helps growing bones absorb the minerals calcium and phosphorous. It can also happen when calcium or phosphorus levels are too low. Your child might not get enough vitamin D if he or she Has dark skin […]
Rosacea Rosacea is a long-term disease that affects your skin and sometimes your eyes. It causes redness and pimples. Rosacea is most common in women and people with fair skin. It most often affects middle-aged and older adults. In most cases, rosacea only affects the face. Symptoms can include Frequent redness of the face, or flushing […]
Rotator Cuff Injuries Your rotator cuff is located in your shoulder area. It is made of muscles and tendons. It helps your shoulder to move and stay stable. Problems with the rotator cuff are common. They include tendinitis, bursitis, and injuries such as tears. Rotator cuff tendons can become inflamed from frequent use or aging. Sometimes they are […]
Rotavirus Infections Rotavirus is a virus that causes gastroenteritis. Symptoms include severe diarrhea, vomiting, fever, and dehydration. Almost all children in the U.S. are likely to be infected with rotavirus before their 5th birthday. Infections happen most often in the winter and spring. It is very easy for children with the virus to spread it to other […]
