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Creutzfeldt-Jakob disease
Learn what can put someone at risk of developing this rare brain disorder that causes dementia.
Cyclic vomiting syndrome
Cyclic vomiting syndrome often starts in childhood and is marked by spells of vomiting several times an hour over a period of hours or days.
Cyclothymia (cyclothymic disorder)
Also called cyclothymic disorder, this mood disorder causes emotional ups and downs that are less extreme than bipolar disorder. Learn about treatment.
Cystitis
Cystitis is a condition that affects the bladder. It happens most often when bacteria cause an infection. But there are other causes, too.
Deep vein thrombosis (DVT)
This potentially serious condition can occur with few or no symptoms. Know the risk factors.
Dehydration
Dehydration is especially common and dangerous for infants, young children and older adults. Learn more about treating and preventing dehydration.
Delirium
Learn what may cause this change in mental abilities. Symptoms develop fast and include confusion and being unaware of surroundings.
Dengue fever
Learn how to identify the symptoms of this serious, mosquito-borne infection and how to protect yourself from infection.
Depression (major depressive disorder)
Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest and can interfere with your daily functioning.
Desmoid tumors
Learn how doctors use surgery, radiation therapy, chemotherapy and other medications to treat desmoid tumors, also known as aggressive fibromatosis.
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