Aerobic exercise
Learning Center
Canker sore
Canker sore — Learn about the causes, treatment and prevention of this painful mouth sore.
COVID-19: Long-term effects
Learn about the possible long-term effects of COVID-19.
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.
Buying athletic shoes? Check your arch
Athletic shoes should be tailored to your arch type (high arch, neutral arch, low arch). Your arches play an important role in how you adapt to various surfaces as you walk. But there is no one "best shoe" for a particular foot type, and comfort and proper fit should be the main criteria you use.
Bronchitis
Bronchitis is an inflammation of the tubes that carry air to and from the lungs. Coughing and shortness of breath are the major symptoms.
Bone metastasis
Learn about the symptoms and causes of cancer that spreads to the bones. Find out about treatments, including medications, radiation and surgery.
Bone health: Tips to keep your bones healthy
Find out what you can do to promote and protect bone health.
Bone and joint problems associated with diabetes
If you have diabetes, you're at increased risk of various bone and joint disorders.
Blepharitis
This often chronic eyelid condition can be difficult to treat. It might be uncomfortable, but it doesn't usually damage eyesight and isn't contagious.
Bladder outlet obstruction: Causes in men?
Find out more about the causes of male bladder outlet obstruction and possible next steps.
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