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Obesity: Should I Have Weight-Loss Surgery?
Obesity: Should I Take Weight-Loss Medicine?
Obesity: Should I Use a Diet Plan to Lose Weight?
Object Stuck in a Child's Airway
Obsessive-Compulsive Disorder (OCD)
Obsessive-Compulsive Disorder: Should I Take Medicine for OCD?
Olecranon Bursitis (Popeye Elbow)
omega-3 polyunsaturated fatty acids
omeprazole and sodium bicarbonate
onasemnogene abeparvovec (Zolgensma)
Open Gallbladder Surgery for Gallstones
Open Inguinal Hernia Repair (Herniorrhaphy, Hernioplasty)
Open Surgery for Kidney Stones
Open-Joint Arthroplasty for Temporomandibular Disorders
ophthalmic irrigation (intraocular)
Opportunistic Infections in HIV
Oral Breathing Devices for Sleep Apnea and Snoring
Oral Breathing Devices for Snoring
Oral Cavity and Nasopharyngeal Cancers Screening (PDQ®): Screening - Patient Information [NCI]
Oral Glucose Tolerance Test (OGTT)
Oral Rehydration Solutions for Children
Orchiectomy for Prostate Cancer
Orchiopexy for Undescended Testicle
Organ Transplants: Antirejection Medicines
Organizing Your Medical Records
Oropharyngeal Cancer Treatment (Adult) (PDQ®): Treatment - Health Professional Information [NCI]
Oropharyngeal Cancer Treatment (Adult) (PDQ®): Treatment - Patient Information [NCI]
Orthognathic Surgery for Malocclusion
Orthopedic Surgery for Cerebral Palsy
Osteoarthritis: Exercising With Arthritis
Osteoarthritis: Heat and Cold Therapy
Osteochondritis Dissecans of a Joint
Osteoporosis Risk in Younger Women
Osteoporosis: Should I Have a Dual-Energy X-Ray Absorptiometry (DXA) Test?
Osteoporosis: Should I Take Bisphosphonate Medicines?
Osteosarcoma Treatment (PDQ®): Treatment - Patient Information [NCI]
Other Health Problems Caused by Herpes Simplex Virus
Other Home Treatment Measures for a First-Degree Burn or Sunburn
Other Treatment: Questions to Ask the Doctor
Other Types of Counseling for PTSD
Ovarian Cancer: Should I Have My Ovaries Removed to Prevent Ovarian Cancer?
Ovarian Germ Cell Tumors Treatment (PDQ®): Treatment - Health Professional Information [NCI]
Ovarian Germ Cell Tumors Treatment (PDQ®): Treatment - Patient Information [NCI]
Ovarian Low Malignant Potential Tumors Treatment (PDQ®): Treatment - Patient Information [NCI]
Overcoming Frustration and Anger
Overnight Dexamethasone Suppression Test
Over-the-Counter Medicine Precautions
Over-the-Counter Medicines for Allergies
Oxygen Therapy: Using Oxygen at Home
Oxygen Treatment for Chronic Obstructive Pulmonary Disease (COPD)