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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?

Obeticholic Acid

Obinutuzumab Injection

Object in the Eye: First Aid

Objects in the Ear

Objects in the Eye

Objects in the Nose

Obsessive-Compulsive Disorder (OCD)

Obstetric Panel

Occupational Asthma

Occupational Therapy

Ocrelizumab Injection

Octreotide Injection

Ofatumumab Injection (Chronic Lymphocytic Leukemia)

Ofatumumab Injection (Multiple Sclerosis)

Office Ergonomics

Ofloxacin Ophthalmic

Olanzapine and Samidorphan

Olanzapine Injection

Olaratumab Injection

Oliceridine Injection

Olodaterol Oral Inhalation

Olopatadine Nasal Spray

Olopatadine Ophthalmic

Omacetaxine Injection

Omadacycline Injection

Omalizumab for Asthma

Omalizumab Injection

Ombitasvir, Paritaprevir, and Ritonavir

Ombitasvir, Paritaprevir, Ritonavir, and Dasabuvir

Omega-3 Fatty Acids

Omeprazole, Clarithromycin, and Amoxicillin

Omidenepag Isopropyl Ophthalmic

OnabotulinumtoxinA Injection

Ondansetron Injection

Open Carpal Tunnel Surgery

Open Gallbladder Surgery for Gallstones

Open Inguinal Hernia Repair (Herniorrhaphy, Hernioplasty)

Open Surgery for Kidney Stones

Open-Joint Arthroplasty for Temporomandibular Disorders

Opioid Use Disorder

Opportunistic Infections in HIV

Oral Breathing Devices for Sleep Apnea and Snoring

Oral Cavity and Nasopharyngeal Cancers Screening (PDQ®): Screening - Health Professional Information [NCI]

Oral Cavity and Nasopharyngeal Cancers Screening (PDQ®): Screening - Patient Information [NCI]

Oral Cavity, Oropharyngeal, Hypopharyngeal, and Laryngeal Cancers Prevention (PDQ®): Prevention - Health Professional Information [NCI]

Oral Cavity, Oropharyngeal, Hypopharyngeal, and Laryngeal Cancers Prevention (PDQ®): Prevention - Patient Information [NCI]

Oral Complications of Cancer Therapies (PDQ®): Supportive care - Health Professional Information [NCI]

Oral Complications of Cancer Therapies (PDQ®): Supportive care - Patient Information [NCI]

Oral Glucose Tolerance Test (OGTT)

Orchiopexy for Undescended Testicle

Organ Transplant

Organ Transplants: Antirejection Medicines

Organizing Your Medical Records

Oritavancin Injection

Oropharyngeal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI]

Oropharyngeal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI]

Orthognathic Surgery for Malocclusion

Orthopedic Surgery for Cerebral Palsy

Orthotics for Foot Problems

Osgood-Schlatter Disease

Osteoarthritis: Exercising With Arthritis

Osteochondritis Dissecans of a Joint

Osteopathic Medicine

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 Undifferentiated Pleomorphic Sarcoma of Bone Treatment (PDQ®): Treatment - Health Professional Information [NCI]

Osteosarcoma Treatment (PDQ®): Treatment - Patient Information [NCI]

Osteotomy for Osteoarthritis

Other Health Problems Caused by Herpes Simplex Virus

Outpatient Services

Ovarian Borderline Tumors Treatment (PDQ®): Treatment - Health Professional Information [NCI]

Ovarian Cancer: Should I Have My Ovaries Removed to Prevent Ovarian Cancer?

Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI]

Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI]

Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Prevention (PDQ®): Prevention - Health Professional Information [NCI]

Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Prevention (PDQ®): Prevention - Patient Information [NCI]

Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Screening (PDQ®): Screening - Health Professional Information [NCI]

Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Screening (PDQ®): Screening - Patient Information [NCI]

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]

Overactive Bladder

Overcoming Anger

Overfeeding a Baby

Overflow Incontinence

Overnight Dexamethasone Suppression Test

Over-the-Counter Medicine Precautions

Over-the-Counter Medicines for Allergies

Overuse Injuries

Oxacillin Injection

Oxaliplatin Injection

Oxybutynin Topical

Oxybutynin Transdermal Patch

Oxygen Therapy: Using Oxygen at Home

Oxygen Treatment for Chronic Obstructive Pulmonary Disease (COPD)

Oxymetazoline Nasal Spray

Oxymetazoline Topical

Oxytocin Injection