First trimester
Learning Center
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
Rumination syndrome
Learn about this condition that results in regurgitating and reswallowing food. Behavioral therapy and medicine are treatments.
Intraoperative magnetic resonance imaging (iMRI)
Find out how neurosurgeons use intraoperative magnetic resonance imaging (iMRI) during brain surgery.
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Tricuspid valve regurgitation
A leaky tricuspid valve may make you feel tired and have difficulty exercising. Learn how this type of heart valve disease is diagnosed and treated.
Brachial plexus injury
Learn about these nerve injuries that usually result from auto or motorcycle accidents, and find out which procedures can help restore arm function.
Transposition of the great arteries
This serious, rare heart problem present at birth requires surgery to correct. Learn about its symptoms and treatment.
Heart arrhythmia
Learn about common heart rhythm disorders that can cause your heart to beat too fast, too slow or irregularly.
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