Fitness basics
Learning Center
Exercise and illness: Work out with a cold?
Play it smart. Ease up on exercise if you have a cold.
Exercise and chronic disease: Get the facts
Find out about the benefits of working out with a long-lasting disease and how to exercise safely.
Discolored semen: What does it mean?
Find out what causes discolored semen.
Digestion: How long does it take?
Digestion takes about two to five days, depending on your system.
Did the definition of Alzheimer's disease change?
What the change in the research definition of Alzheimer's disease means for you.
Diarrhea
Diarrhea: Symptom — Overview covers definition, causes of acute and chronic diarrhea.
Demyelinating disease: What can you do about it?
Learn the causes and types of these diseases that affect the protective covering of nerves, which include multiple sclerosis. Also learn how they're treated.
Delusional parasitosis
Learn more about this condition and positive steps you can take to manage the symptoms.
Degenerative changes in the spine: Is this arthritis?
Degenerative changes in the spine visible on X-rays indicate osteoarthritis of the spine.
Concussion in children: What are the symptoms?
Whether your child's concussion is mild or severe, allow time to recover.
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