Nutritional supplements
Learning Center
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Blocked tear duct
Watery, irritated eyes may occur when your tears can't drain normally. Learn about this common eye condition that affects newborns and sometimes, adults.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Multiple sclerosis: Can it cause seizures?
Seizures occur more often in people with multiple sclerosis than in the general population.
Pulse pressure: An indicator of heart health?
Pulse pressure may be a strong predictor of heart problems, especially for older adults.
Tailbone pain: How can I relieve it?
Tailbone pain can have many causes and treatments.
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.
Calcium supplements: When should they be taken?
Timing matters when taking these supplements. Learn how to take them.
Hirschsprung's disease
This digestive disorder that's present at birth affects the nerves in the colon. It causes severe constipation but can be treated.
Common cold in babies
This viral infection causes a runny nose and nasal congestion in babies. Find out how to ease symptoms and when to see a doctor.
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