Nutrition basics
Learning Center
Pneumonia
Pneumonia — Learn about the symptoms, causes and treatment of this serious lung infection.
Peyronie disease
Understand what causes bent and painful erections and learn what treatments are available.
Peripheral neuropathy
Learn what may cause the prickling, tingling or numb sensations of nerve damage and how to prevent and treat this painful disorder.
Pancreatic cancer
Learn about symptoms, risk factors, prevention, diagnosis, surgery, chemotherapy and other treatments for this serious condition affecting the pancreas.
Overactive bladder
Learn how you can get relief for sudden urges to urinate, which may point to overactive bladder or urinary incontinence.
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.
Orthostatic hypotension (postural hypotension)
This form of low blood pressure might cause dizziness, lightheadedness or fainting when rising from sitting or lying down.
Orchitis
This inflammation of one or both testicles can cause pain and infertility. It's usually caused by a bacterial infection or the mumps virus.
Ocular rosacea
Learn about symptoms, causes and treatments of ocular rosacea — an eye condition that often affects people who have skin rosacea.
Occupational asthma
Dust, fumes and other substances at work can cause asthma. Find out how to recognize this common type of asthma.
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