Fitness basics
Learning Center
Parvovirus infection
Learn more about the symptoms, causes, treatment and prevention of this common childhood infection — sometimes called slapped-cheek disease.
Partial anomalous pulmonary venous return
In this heart problem present at birth, some of the blood vessels of the lungs connect to the wrong places in the heart. Learn when treatment is needed.
Painful intercourse (dyspareunia)
Pain during sex can happen for many reasons, ranging from physical conditions to emotional concerns. Medicines or other therapies may help.
Ovarian hyperstimulation syndrome
Learn about this possible complication of fertility treatments and how to recognize when you need to contact your care team.
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 cancer
Learn more about cancer of the ovaries, including symptoms and treatments, such as surgery, chemotherapy and targeted therapy.
Osteoporosis
Fractures associated with this bone-weakening condition can be life-altering. Good nutrition, regular exercise and medications can help.
Osteochondritis dissecans
Osteochondritis dissecans most commonly affects children who are very active in sports. Learn about the symptoms and treatment of this joint condition.
Oral thrush
Oral thrush is a fungal infection caused by the overgrowth of Candida albicans, which causes creamy white lesions on the tongue and lining of your mouth.
Oppositional defiant disorder (ODD)
This childhood mental health condition includes frequent and persistent anger, irritability, arguing, defiance or vindictiveness toward authority.
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