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Obesity Obesity Surgery, Deciding About Obesity, Biliopancreatic Diversion for Obesity, Deciding About Medications for Treatment Obesity, Gastric Banding for Obesity, Gastric Bypass for Obesity, Orlistat for Obesity, Phentermine for Obesity, Sibutramine for Obesity, Stomach Stapling for Objects in the Ear Objects in the Eye Objects in the Nose Obsessive Compulsive Disorder (OCD), Antidepressants for Obsessive Compulsive Disorder (OCD), Deciding About Medicines Obsessive-Compulsive Disorder (OCD) 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 a Sleep Study Obstructive Sleep Apnea, Deciding About Surgery Obstructive Sleep Apnea, Tonsillectomy for Obstructive Sleep Apnea, Tracheostomy for Obstructive Sleep Apnea, Uvulopalatopharyngoplasty for Occupational Therapy OCD (Obsessive Compulsive Disorder) OCD (Obsessive Compulsive Disorder), Antidepressants for OCD (Obsessive Compulsive Disorder), Deciding About Medicines Ocean Stings and Scrapes Office Ergonomics Older Adult Health Olecranon Bursitis (Popeye Elbow) 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 surgery for kidney stones Open-joint arthroplasty for TM disorders Opiate pain relievers for low back pain Opioid analgesics for chronic pain Opioids for a herniated disc Opioids for osteoarthritis Opioids for restless legs syndrome Opioids for spinal stenosis Oral anticoagulants for deep vein thrombosis Oral antifungal medicine for fungal nail infections Oral antihistamines for atopic dermatitis Oral Cancer Oral cancer: Prevention - Patient Information [NCI PDQ] Oral cancer: Screening - Patient Information [NCI PDQ] Oral Candidiasis Oral Candidiasis (Thrush), KOH (Potassium Hydroxide) Preparation for Oral Candidiasis (Thrush), Potassium Hydroxide Preparation for Oral cavity cancer (lip and oral cavity cancer): Prevention - Health Professional Information [NCI PDQ] Oral cavity cancer (lip and oral cavity cancer): Screening - Health Professional Information [NCI PDQ] Oral cavity cancer (lip and oral cavity cancer): Treatment - Health Professional Information [NCI PDQ] Oral cavity cancer (lip and oral cavity cancer): Treatment - Patient Information [NCI PDQ] Oral Complications of Chemotherapy and Head/Neck Radiation: Supportive care - Health Professional Information [NCI PDQ] Oral Complications of Chemotherapy and Head/Neck Radiation: Supportive care - Patient Information [NCI PDQ] Oral corticosteroids for atopic dermatitis Oral medications for vaginal yeast infections Orchiectomy Orchiopexy for undescended testicle Organ Transplant Organic Foods Orlistat for obesity Oromaxillary Fistula Repair Oropharyngeal cancer: Treatment - Health Professional Information [NCI PDQ] Oropharyngeal cancer: Treatment - Patient Information [NCI PDQ] Orthodontics Orthopedic surgery for cerebral palsy Orthophosphate for kidney stones Oseltamivir or zanamivir Osteoarthritis Osteoarthritis of the Knee, Hyaluronan Injections for 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 Osteopathy Osteopenia Osteoporosis Osteoporosis Risk Calculator Osteoporosis Treatment with Bisphosphonates, Deciding About Osteoporosis, Bisphosphonates for Osteoporosis, Calcitonin for Osteoporosis, Estrogen for Osteoporosis, Hormone Replacement Therapy (HRT) for Osteoporosis, HRT (Hormone Replacement Therapy) for Osteoporosis, Parathyroid Hormone for Osteoporosis, Ralozifene for Osteoporosis, Testosterone for Osteoporosis: Taking calcium Osteosarcoma/Malignant Fibrous Histiocytoma of Bone: Treatment - Health Professional Information [NCI PDQ] Osteosarcoma/Malignant Fibrous Histiocytoma of Bone: Treatment - Patient Information [NCI PDQ] Osteotomy for osteoarthritis Ostomy, Caring for an OTC (Over-the-Counter) Medications and Products Other antidepressants for depression Other antiplatelet medications for heart attack and unstable angina Other Types of Counseling for PTSD Otitis Externa ( Swimmer's Ear) Otitis Media (Ear Infections) Otitis Media, Antibiotics for Outdoor Allergens, Avoiding Outpatient Services Ovarian and Breast Cancer (BRCA) Genetic Test Ovarian Cancer Ovarian Cancer, Hysterectomy for Ovarian cancer: Prevention - Patient Information [NCI PDQ] Ovarian Cyst, Surgery for Ovarian Cysts, Birth Control Pills for Ovarian Cysts, Functional Ovarian epithelial cancer: Prevention - Health Professional Information [NCI PDQ] Ovarian epithelial cancer: Screening - Health Professional Information [NCI PDQ] Ovarian epithelial cancer: Screening - Patient Information [NCI PDQ] Ovarian epithelial cancer: Treatment - Health Professional Information [NCI PDQ] Ovarian epithelial cancer: Treatment - Patient Information [NCI PDQ] Ovarian Failure, Premature Ovarian low malignant potential tumors: Treatment - Health Professional Information [NCI PDQ] Ovarian low malignant potential tumors: Treatment - Patient Information [NCI PDQ] Overactive Bladder Overactive Thyroid Over-the-Counter Medications and Products Overweight Child Oxaliplatin Oxcarbazepine for epilepsy Oxybutynin chloride for daytime wetting and bed-wetting Oxygen therapy for heart failure Oxygen therapy: Using oxygen at home Oxygen treatment for chronic obstructive pulmonary disease (COPD) Oxytocin for breast-feeding