Fitness basics
Learning Center
COVID-19 vaccines for kids: What you need to know
Learn about the safety and effectiveness of COVID-19 vaccines for kids, the possible side effects, and the benefits of vaccination.
Sun damage
See photos of common skin conditions that are caused by too much time in the sun.
Balance exercises
Balance exercises can improve your balance and help prevent falls. See how they're done.
Congenital myasthenic syndromes
These rare hereditary conditions result in a problem in nerve stimulation, causing muscle weakness that worsens with physical activity.
Types of dermatitis
Learn to identify types of dermatitis by how the skin looks. Examples include atopic dermatitis, contact dermatitis and seborrheic dermatitis.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
Bent penis
Learn what can cause a curved erection and when you may need to see a health care provider.
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