Health Topics A-Z

Coronaviruses are a large family of viruses. They usually cause mild to moderate respiratory tract illnesses in humans.

Crohn’s disease is a chronic inflammatory condition of the digestive tract.

Dementia is an umbrella term used to describe a range of neurological conditions affecting the brain that worsen over time. There are many types of dementia, with Alzheimer’s disease being the most common.

Dengue fever is a mosquito-borne infectious disease caused by any of four related dengue viruses, posing a significant threat to public health worldwide.

Depression is serious mental illness that affects how a person feels, thinks, and handles daily activities such as sleeping, eating, or working.

Developmental language disorder (DLD) is a communication disorder that interferes with learning, understanding, and using language. Developmental language disorder affects a child’s speaking, listening, reading, and writing, and its impact persists into adulthood.

Diabetic eye disease is a group of eye problems that can affect people with diabetes. These conditions include diabetic retinopathy, diabetic macular edema, cataracts, and glaucoma.

Down syndrome is a genetic condition that occurs when a person is born with an extra copy of chromosome 21. The extra chromosome can influence learning, development, and health in different ways from person to person.  Advances in research and health care have contributed to longer lives and improved quality of life for individuals with Down syndrome.

Dry eye happens when your eyes don't make enough tears to properly wet the surface of the eye, or when your tears don't work correctly.

Dry mouth, also called xerostomia, is a condition in which there is not enough saliva to keep the mouth wet.