Teen health
Learning Center
Lung nodules: Can they be cancerous?
Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if you have a lung nodule.
Low blood sodium in older adults: A concern?
For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.
Loss of taste and smell: Natural with aging?
Aging can play a role in the loss of taste and smell — but not always.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
Isometric exercises: Good for strength training?
Learn more about isometric exercises that contract a particular muscle or group of muscles.
Isolated systolic hypertension: A health concern?
Both the top and bottom numbers in blood pressure readings hold clues about your health. But if just the top number is high, it might be a concern.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Hyperinsulinemia: Is it diabetes?
Hyperinsulinemia often is associated with type 2 diabetes.
Hyperinflated lungs: What does it mean?
If you can’t breathe out well, as in COPD, air may get trapped inside your lungs. As you breathe in more air over time, your lungs get too big and stiff.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
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