A to Z
Health Topics
- Obesity
- 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
- Object in the Vagina
- Objects in the Ear
- Objects in the Eye
- Objects in the Nose
- Obsessive-Compulsive Disorder (OCD)
- Obstetric Panel
- Obstructive sleep apnea: Fast Facts
- Occupational Asthma
- Occupational Therapy
- Ocrelizumab Injection
- Octreotide
- Octreotide Injection
- Odevixibat
- Ofatumumab Injection (Chronic Lymphocytic Leukemia)
- Ofatumumab Injection (Multiple Sclerosis)
- Office Ergonomics
- Ofloxacin
- Ofloxacin Ophthalmic
- Ofloxacin Otic
- Olanzapine
- Olanzapine and Samidorphan
- Olanzapine Injection
- Olaparib
- Olaratumab Injection
- Older Adults: Be Inspired to Get Active
- Older Adults: Getting Active After a Health Scare
- Older Adults: Making Physical Activity a Routine
- Older Adults: Overcoming Barriers to Fitness
- Oliceridine Injection
- Olmesartan
- Olodaterol Oral Inhalation
- Olopatadine Nasal Spray
- Olopatadine Ophthalmic
- Olsalazine
- Olutasidenib
- Omacetaxine Injection
- Omadacycline
- Omadacycline Injection
- Omalizumab for Asthma
- Omalizumab Injection
- Ombitasvir, Paritaprevir, and Ritonavir
- Ombitasvir, Paritaprevir, Ritonavir, and Dasabuvir
- Omega-3 Fatty Acids
- Omeprazole
- Omeprazole, Clarithromycin, and Amoxicillin
- Omidenepag Isopropyl Ophthalmic
- OnabotulinumtoxinA Injection
- Ondansetron
- Ondansetron Injection
- Open Breast Biopsy: Before Your Surgery
- Open Breast Biopsy: Returning Home
- Open Carpal Tunnel Surgery
- Open Gallbladder Surgery for Gallstones
- Open Inguinal Hernia Repair (Herniorrhaphy, Hernioplasty)
- Open Surgery for Kidney Stones
- Open-Heart Surgery: Returning Home
- Open-Joint Arthroplasty for Temporomandibular Disorders
- Ophthalmoscopy
- Opicapone
- Opioid Use Disorder
- Opioids
- Opioids for Children
- Opioids: Know What's Safe
- Opportunistic Infections in HIV
- Optic Neuritis
- Oral Breathing Devices for Sleep Apnea and Snoring
- Oral Cancer
- 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)
- Orchiectomy
- Orchiopexy for Undescended Testicle
- Organ Transplant
- Organ Transplants: Antirejection Medicines
- Organic Foods
- Organizing Your Medical Records
- Oritavancin Injection
- Orlistat
- Oropharyngeal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI]
- Oropharyngeal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI]
- Orphenadrine
- Orthognathic Surgery for Malocclusion
- Orthopedic Surgery for Cerebral Palsy
- Orthotics for Foot Problems
- Oseltamivir
- Osgood-Schlatter Disease
- Osimertinib
- Ospemifene
- Osteoarthritis
- Osteoarthritis: Exercising With Arthritis
- Osteoarthritis: Fast facts
- Osteochondritis Dissecans of a Joint
- Osteopathic Medicine
- Osteoporosis
- Osteoporosis Risk Factors
- Osteoporosis Risk in Younger Women
- Osteoporosis Screening
- Osteoporosis: After Your Fracture
- 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
- Oteseconazole
- Other Health Problems Caused by Herpes Simplex Virus
- Outpatient Services
- Ovarian Borderline Tumors Treatment (PDQ®): Treatment - Health Professional Information [NCI]
- Ovarian Cancer
- 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 Cancers Treatment (PDQ®): Treatment - 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]
- 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]
- Over-the-Counter Medicine Precautions
- Over-the-Counter Medicines for Allergies
- Overactive Bladder
- Overcoming Anger
- Overfeeding a Baby
- Overflow Incontinence
- Overnight Dexamethasone Suppression Test
- Overtraining
- Overuse Injuries
- Oxacillin Injection
- Oxaliplatin Injection
- Oxandrolone
- Oxaprozin
- Oxazepam
- Oxcarbazepine
- Oxiconazole
- Oxybutynin
- Oxybutynin Topical
- Oxybutynin Transdermal Patch
- Oxycodone
- Oxygen Therapy
- Oxygen Therapy: Using Oxygen at Home
- Oxygen Treatment for Chronic Obstructive Pulmonary Disease (COPD)
- Oxymetazoline Nasal Spray
- Oxymetazoline Topical
- Oxymorphone
- Oxytocin
- Oxytocin Injection
- Ozanimod
- Ozenoxacin