Fitness basics
Learning Center
Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and diarrhea. Learn ways to protect yourself.
Occupational asthma
Dust, fumes and other substances at work can cause asthma. Find out how to recognize this common type of asthma.
Orthostatic hypotension (postural hypotension)
This form of low blood pressure might cause dizziness, lightheadedness or fainting when rising from sitting or lying down.
Osteoarthritis
This most common form of arthritis mainly affects joints in your hands, knees, hips and spine. There's no cure, but symptoms can be managed.
Osteoporosis
Fractures associated with this bone-weakening condition can be life-altering. Good nutrition, regular exercise and medications can help.
Ovarian cancer
Learn more about cancer of the ovaries, including symptoms and treatments, such as surgery, chemotherapy and targeted therapy.
Ovarian cysts
Many women have ovarian cysts at some time. Most are harmless, but some can cause serious symptoms. Know what symptoms to watch for.
Ovarian hyperstimulation syndrome
Learn about this possible complication of fertility treatments and how to recognize when you need to contact your care team.
Overactive bladder
Learn how you can get relief for sudden urges to urinate, which may point to overactive bladder or urinary incontinence.
Painful intercourse (dyspareunia)
Pain during sex can happen for many reasons, ranging from physical conditions to emotional concerns. Medicines or other therapies may help.
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