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Find the resources you need to make informed decisions and improve your health by searching our health library. You'll find up-to-date and evidenced-based information with easy-to-understand explanations of medical conditions, symptoms, tests, and treatments for thousands of topics.

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Health Topics A-Z

Learning Centers

Health Topics A-Z

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Obesity
Obesity: Should I Have Weight-Loss Surgery? Decision Point
Obesity: Should I Take Weight-Loss Medicine? Decision Point
Obesity: Should I Use a Diet Plan to Lose Weight? Decision Point
Obeticholic Acid Oral Tablet (OBETICHOLIC ACID - ORAL)
Obinutuzumab Injection (OBINUTUZUMAB - INJECTION)
Object in the Eye: First Aid
Object in the Vagina
Objects in the Ear Symptom
Objects in the Eye Symptom
Objects in the Nose Symptom
Obsessive-Compulsive Disorder (OCD)
Obstetric Panel

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Open Carpal Tunnel Surgery Surgery Overview
Open Gallbladder Surgery for Gallstones Surgery Overview
Open Inguinal Hernia Repair (Herniorrhaphy, Hernioplasty) Surgery Overview
Open Surgery for Kidney Stones Surgery Overview
Open-Joint Arthroplasty for Temporomandibular Disorders Surgery Overview
Ophthalmoscopy Medical Test
Opicapone Oral Capsule (OPICAPONE - ORAL)
Opioid Use Disorder
Opioids
Opium Oral Solution (OPIUM TINCTURE - ORAL)
Opportunistic Infections in HIV
Optic Neuritis

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Oral Breathing Devices for Sleep Apnea and Snoring
Oral Cancer
Oral Cavity and Nasopharyngeal Cancers Screening (PDQ®): Screening - Health Professional Information [NCI] National Cancer Institute
Oral Cavity and Nasopharyngeal Cancers Screening (PDQ®): Screening - Patient Information [NCI] National Cancer Institute
Oral Cavity, Oropharyngeal, Hypopharyngeal, and Laryngeal Cancers Prevention (PDQ®): Prevention - Health Professional Information [NCI] National Cancer Institute
Oral Cavity, Oropharyngeal, Hypopharyngeal, and Laryngeal Cancers Prevention (PDQ®): Prevention - Patient Information [NCI] National Cancer Institute
Oral Complications of Cancer Therapies (PDQ®): Supportive care - Health Professional Information [NCI] National Cancer Institute
Oral Complications of Cancer Therapies (PDQ®): Supportive care - Patient Information [NCI] National Cancer Institute
Oral Glucose Tolerance Test (OGTT) Medical Test
Orchiectomy Surgery Overview
Orchiopexy for Undescended Testicle Surgery Overview
Organ Transplant
Organ Transplants: Antirejection Medicines
Organic Foods
Organizing Your Medical Records
Oritavancin Injection (ORITAVANCIN - INJECTION)
Orlistat Oral Capsule (ORLISTAT - ORAL)
Oropharyngeal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] National Cancer Institute
Oropharyngeal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] National Cancer Institute
Orphenadrine Extended Release Oral Tablet (ORPHENADRINE - ORAL)
Orphenadrine Injection (ORPHENADRINE - INJECTION)
Orthognathic Surgery for Malocclusion Surgery Overview
Orthopedic Surgery for Cerebral Palsy Surgery Overview
Orthotics for Foot Problems

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Oseltamivir Oral Capsule (OSELTAMIVIR - ORAL)
Oseltamivir Oral Suspension (OSELTAMIVIR SUSPENSION - ORAL)
Osgood-Schlatter Disease
Osilodrostat Oral Tablet (OSILODROSTAT - ORAL)
Osimertinib Oral Tablet (OSIMERTINIB - ORAL)
Ospemifene Oral Tablet (OSPEMIFENE - ORAL)
Osteoarthritis
Osteoarthritis: Exercising With Arthritis Actionset
Osteochondritis Dissecans of a Joint
Osteopathic Medicine
Osteoporosis
Osteoporosis Risk Factors
Osteoporosis Risk in Younger Women
Osteoporosis Screening
Osteoporosis: Should I Have a Dual-Energy X-Ray Absorptiometry (DXA) Test? Decision Point
Osteoporosis: Should I Take Bisphosphonate Medicines? Decision Point
Osteosarcoma and Undifferentiated Pleomorphic Sarcoma of Bone Treatment (PDQ®): Treatment - Health Professional Information [NCI] National Cancer Institute
Osteosarcoma Treatment (PDQ®): Treatment - Patient Information [NCI] National Cancer Institute
Osteotomy for Osteoarthritis Surgery Overview

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Outpatient Services

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Ovarian Borderline Tumors Treatment (PDQ®): Treatment - Health Professional Information [NCI] National Cancer Institute
Ovarian Cancer
Ovarian Cancer: Should I Have My Ovaries Removed to Prevent Ovarian Cancer? Decision Point
Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] National Cancer Institute
Ovarian Epithelial, Fallopian Tube, and Primary Peritoneal Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] National Cancer Institute
Ovarian Germ Cell Tumors Treatment (PDQ®): Treatment - Health Professional Information [NCI] National Cancer Institute
Ovarian Germ Cell Tumors Treatment (PDQ®): Treatment - Patient Information [NCI] National Cancer Institute
Ovarian Low Malignant Potential Tumors Treatment (PDQ®): Treatment - Patient Information [NCI] National Cancer Institute
Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Prevention (PDQ®): Prevention - Health Professional Information [NCI] National Cancer Institute
Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Prevention (PDQ®): Prevention - Patient Information [NCI] National Cancer Institute
Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Screening (PDQ®): Screening - Health Professional Information [NCI] National Cancer Institute
Ovarian, Fallopian Tube, and Primary Peritoneal Cancers Screening (PDQ®): Screening - Patient Information [NCI] National Cancer Institute
Over-the-Counter Medicine Precautions
Over-the-Counter Medicines for Allergies
Overactive Bladder
Overcoming Anger
Overfeeding a Baby
Overflow Incontinence
Overnight Dexamethasone Suppression Test Medical Test
Overtraining
Overuse Injuries

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