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Depression is a serious medical illness. It affects almost 7 percent of U.S. adults. It causes feelings of sadness, hopelessness, and frustration that do not go away. Learn about treatments. READ MORE

Dentures are false teeth made to replace lost teeth. Dentures can be partial or complete. Read more about how to properly care for and adjust to them. READ MORE

Investing in dental health can yield many benefits. Discover a list of simple ways to keep your oral health on track. READ MORE

Dengue is an infection caused by a virus. You can get it if an infected mosquito bites you. Learn more about risk and prevention. READ MORE

People with dementia have serious problems with two or more brain functions, such as memory and language. Affects the ability to do normal activities. READ MORE

Delirium is a mental state in which you are confused, disoriented, and not able to think or remember clearly. It is often temporary and treatable. READ MORE

Dehydration means your body doesn't have enough fluid. Learn about the signs and symptoms of dehydration, and what to do about it. READ MORE

Degenerative nerve diseases, or neurodegenerative diseases, are disorders that destroy cells in your nervous system. Learn about the types and treatments. READ MORE

Deep vein thrombosis (DVT), is a blood clot that forms in a vein deep in the body, often in the leg. Learn about the causes, symptoms, and treatments. READ MORE

The DASH eating plan helps lower high blood pressure. It recommends eating fruits, vegetables, and whole grains, and limiting salt, bad fats, and sweets. Learn about this heart-healthy eating plan. READ MORE

Dandruff, flaking of skin on your scalp, can be annoying and itchy. Learn about how to treat it, as well as cradle cap and other scalp conditions. READ MORE

Cytomegalovirus (CMV) is a virus found worldwide. Most people with CMV don't need treatment. Learn about who is at risk and how to prevent infection. READ MORE