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Obesity Obesity and Pregnancy Obesity, Biliopancreatic Diversion for Obesity, Gastric Banding for Obesity, Gastric Bypass for Obesity, Stomach Stapling for 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 in the Eye: First Aid Object in the Vagina Object Stuck in a Child's Airway Object Stuck in the Throat Objects in the Ear Objects in the Eye Objects in the Nose Obsessive-Compulsive Disorder (OCD) Obsessive-Compulsive Disorder: Should I Take Medicine for OCD? Obstacles to Grieving Obstetric Panel Obstructive Hypertrophic Cardiomyopathy Obstructive Sleep Apnea Obstructive Sleep Apnea, Adenoidectomy for Obstructive Sleep Apnea, Continuous Positive Airway Pressure (CPAP) Therapy for Obstructive Sleep Apnea, CPAP (Continuous Positive Airway Pressure) Therapy for Obstructive Sleep Apnea, Deciding About Surgery Obstructive Sleep Apnea, Tonsillectomy for Obstructive Sleep Apnea, Tracheostomy for Obstructive Sleep Apnea, Uvulopalatopharyngoplasty for Occupational Asthma Occupational Therapy Occupational Therapy for People With Chronic Disease OCD (Obsessive Compulsive Disorder) OCD (Obsessive Compulsive Disorder), Deciding About Medicines OCD Medicines Other Than SSRIs OCD: Exposure and Prevention Therapy OCD: How Family Members Can Cope Ocean Stings and Scrapes Office Ergonomics Older Adult Health Olecranon Bursitis (Popeye Elbow) Omega-3 Fatty Acids for Bipolar Disorder Onychomycosis Oopherectomy with Hysterectomy, Deciding About Oophorectomy Oophorectomy to prevent ovarian cancer, deciding about Open Carpal Tunnel Surgery for Carpal Tunnel Syndrome Open Gallbladder Surgery for Gallstones Open Inguinal Hernia Repair (Herniorrhaphy, Hernioplasty) Open Prostatectomy for Benign Prostatic Hyperplasia Open Repair Surgery for Abdominal Aortic Aneurysm Open Surgery for Kidney Stones Open-Joint Arthroplasty for Temporomandibular Disorders Opioid Pain Relievers for Low Back Pain Opioid Pain Relievers for Osteoarthritis Opioid Use Disorder Opioids Opportunistic Infections in HIV Oral Antivirals for Cold Sores Oral Breathing Devices for Snoring Oral Cancer Oral Candidiasis Oral Cavity and Oropharyngeal Cancer Prevention (PDQ®): Prevention - Health Professional Information [NCI] Oral Cavity and Oropharyngeal Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] Oral Cavity and Oropharyngeal Cancer Screening (PDQ®): Screening - Health Professional Information [NCI] Oral Cavity and Oropharyngeal Cancer Screening (PDQ®): Screening - Patient Information [NCI] Oral Complications of Chemotherapy and Head/Neck Radiation (PDQ®): Supportive care - Health Professional Information [NCI] Oral Complications of Chemotherapy and Head/Neck Radiation (PDQ®): Supportive care - Patient Information [NCI] Oral Diabetes Medicines That Can Cause Low Blood Sugar Oral Rehydration Solutions for Children Orchiectomy for Prostate Cancer Orchiectomy for Testicular Cancer Orchiopexy for Undescended Testicle Organ Transplant Organ Transplants: Antirejection Medicines Organic Foods Organizing Your Medical Records Oromaxillary Fistula Repair Oropharyngeal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] Oropharyngeal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] Orthodontics Orthopedic Surgery for Cerebral Palsy Orthotics for Foot Problems Osgood-Schlatter Disease Osteoarthritis Osteoarthritis, Acetaminophen for Osteoarthritis, Corticosteroid Injections for Osteoarthritis, History and Physical Examination for Osteoarthritis, Medical History and Physical Examination for Osteoarthritis, Opioid Pain Relievers for Osteoarthritis, Osteotomy for Osteoarthritis, Physical Examination and Medical History for Osteoarthritis: Exercising With Arthritis Osteoarthritis: Heat and Cold Therapy Osteochondritis Dissecans of a Joint Osteopathic Medicine Osteopenia Osteoporosis Osteoporosis in Men Osteoporosis Risk Factors Osteoporosis Risk in Younger Women Osteoporosis Screening Osteoporosis: Should I Have a Dual-Energy X-Ray Absorptiometry (DXA) Test? Osteoporosis: Should I Take Bisphosphonate Medicines? Osteosarcoma and Malignant Fibrous Histiocytoma of Bone Treatment (PDQ®): Treatment - Health Professional Information [NCI] Osteosarcoma and Malignant Fibrous Histiocytoma of Bone Treatment (PDQ®): Treatment - Patient Information [NCI] Osteotomy and Paget's Disease Osteotomy for Osteoarthritis Ostomy, Caring for an OTC (Over-the-Counter) Medications and Products Other Conditions With Symptoms Similar to Spinal Stenosis Other Health Problems Caused by Herpes Simplex Virus Other Home Treatment Measures for a First-Degree Burn or Sunburn Other Medicines for High Blood Pressure Other Types of Counseling for PTSD Otitis Externa ( Swimmer's Ear) Otitis Media (Ear Infections) Outdoor Allergens, Avoiding Outpatient Services Ovarian Cancer Ovarian Cancer, Hysterectomy for Ovarian Cancer: Should I Have My Ovaries Removed to Prevent Ovarian Cancer? Ovarian Cyst, Surgery for Ovarian Cysts, Functional Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Health Professional Information Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] Ovarian Failure, Premature 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 - Health Professional Information [NCI] Ovarian Low Malignant Potential Tumors Treatment (PDQ®): Treatment - Patient Information [NCI] Ovarian, Fallopian Tube, and Primary Peritoneal Cancer Prevention (PDQ®): Prevention - Health Professional Information [NCI] Ovarian, Fallopian Tube, and Primary Peritoneal Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] Ovarian, Fallopian Tube, and Primary Peritoneal Cancer Screening (PDQ®): Screening - Health Professional Information [NCI] Ovarian, Fallopian Tube, and Primary Peritoneal Cancer Screening (PDQ®): Screening - Patient Information [NCI] Overactive Bladder Overactive Thyroid Overcoming Frustration and Anger Overfeeding a Baby Overflow Incontinence Over-the-Counter Medications and Products Over-the-Counter Medicine Precautions Over-the-Counter Medicines for Allergies Overtraining Overuse Injuries Overweight Child Oxygen Therapy Oxygen Therapy: Using Oxygen at Home Oxygen Treatment for Chronic Obstructive Pulmonary Disease (COPD) Oxytocin