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Color Blindness What is color blindness? Color blindness is when you see colors differently than most people do. The retina is the light-sensitive lining in the back part of your eye. It sends visual information to your brain. Your retina has special cells that detect color

Insomnia What is insomnia? You've likely had nights when you couldn't fall asleep, no matter how desperately you tried. When you can't sleep, the ticking of the clock only reminds you of your exhaustion and the endless hours until morning. And perhaps you finally drop off around

Vulvitis What is vulvitis? Vulvitis is an inflammation of the vulva, the soft folds of skin outside the vagina. It’s a symptom that can result from an array of diseases. This can include infections, injuries, allergies, or irritants. Because it can be challenging to find the

Chronic Bronchitis What is chronic bronchitis? Bronchitis is inflammation of the breathing tubes. These are the airways called bronchi. This inflammation causes too much mucus to be made and other changes. Bronchitis can be acute (short-term) or chronic (long-term). Chronic

Monoclonal Gammopathies What are monoclonal gammopathies? Monoclonal gammopathies are conditions in which abnormal proteins (antibodies) are found in the blood. These proteins are made from a small number of plasma cells in the bone marrow. The most common condition linked with

Understanding the mRNA COVID-19 Vaccine Vaccines for COVID-19 are available. What do you need to know about getting an mRNA COVID-19 vaccine? What can you expect after you get it? Read on to learn more. COVID-19 information is updated regularly. Visit the CDC website for the

Maintaining Weight Loss Benefits of maintaining weight loss Losing weight is hard for many people. But it's even more challenging to keep the weight off. Many people who lose a large amount of weight have problems keeping it off over time. One theory is that people who eat fewer

Cytomegalovirus (CMV) in Newborns What is CMV in newborns? CMV (cytomegalovirus) is a type of herpes virus. It's very common. It affects people of all ages and in all parts of the U.S. In most cases, CMV causes mild symptoms, or no symptoms at all. But it can cause serious

Multiple Sclerosis and Pregnancy What is multiple sclerosis? Multiple sclerosis (MS) is a chronic disease of the central nervous system, which is made up of the brain and spinal cord. MS is unpredictable. The symptoms of MS can range from mild to disabling, such as losing the

Stages of Alzheimer Disease Alzheimer disease is a type of brain disorder. It causes memory loss, confusion, and changes in personality, and gradual loss of independence. It is the most common type of dementia. At first, people with this disease have only a small amount of memory