First trimester
Learning Center
Spina bifida
Learn about this condition in which an unborn baby's spine and spinal cord don't form properly. Surgery during pregnancy may be a treatment option.
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
Stye (sty)
A stye (sty) is a painful red bump along the eyelash line that can often be treated with home remedies. Find out more about this irritating eyelid infection.
Sundowning: Late-day confusion
Sundowning isn't a disease. It's a symptom that often occurs in people with dementia.
Tailbone pain: How can I relieve it?
Tailbone pain can have many causes and treatments.
Tay-Sachs disease
This rare, inherited disease causes a buildup of fatty acids that damages the brain and typically results in muscle control loss, blindness and paralysis.
Tetralogy of Fallot
These four heart problems present at birth change how blood flows through the body. Know the symptoms and treatment.
The dawn phenomenon: What can you do?
Take steps to prevent this early-morning increase in blood sugar.
Thyroid disease: Can it affect a person's mood?
Thyroid disease can affect mood, but those symptoms are rarely the only evidence of thyroid disease.
Tongue-tie (ankyloglossia)
With tongue-tie (ankyloglossia), a band of tissue (frenulum) tethers the tongue, restricting the range of motion. Learn about symptoms and treatment.
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