Elastic resistance
Learning Center
Croup
This upper airway infection makes it harder to breathe and causes a barking cough. It involves swelling around the voice box, windpipe and bronchial tubes.
Degenerative changes in the spine: Is this arthritis?
Degenerative changes in the spine visible on X-rays indicate osteoarthritis of the spine.
Delusional parasitosis
Learn more about this condition and positive steps you can take to manage the symptoms.
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.
Did the definition of Alzheimer's disease change?
What the change in the research definition of Alzheimer's disease means for you.
Digestion: How long does it take?
Digestion takes about two to five days, depending on your system.
Discolored semen: What does it mean?
Find out what causes discolored semen.
Double-outlet right ventricle
In this heart condition present at birth, two major blood vessels aren't attached to the heart in the usual positions. Learn how it's treated.
Dry skin
Learn more about the causes of and self-care tips for a common flaky skin condition that tends to be temporary or seasonal but may become a lifelong problem.
Fingernails: Do's and don'ts for healthy nails
Find out the signs of a problem with your fingernails, plus tips for taking care of them.
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