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Obesity
Obesity is a chronic disease involving excess body fat that may affect health and well-being. It can affect people of any age,…
Obsessive Compulsive Disorder
Obsessive Compulsive Disorder is a mental health condition involving recurring, intrusive thoughts, images, or urges called obsessions. These experiences may lead to…
Obstetrical Tetanus
Obstetrical tetanus is a severe infection caused by a toxin made by Clostridium tetani bacteria. The bacteria’s spores can enter contaminated tissue…
Obstructive Sleep Apnoea
OSA stands for obstructive sleep apnea, a condition in which the upper airway repeatedly narrows or closes during sleep. These blockages reduce…
Oesophageal Varices
Oesophageal varices are enlarged, fragile veins in the lower oesophagus, the tube that carries food to the stomach. They usually develop when…
Oligodendroglioma
Oligodendroglioma is a primary central nervous system tumor that begins in cells related to oligodendrocytes, which help support nerve cells. These oligodendrogliomas…
Oligospermia
Oligospermia means having a lower-than-expected concentration of sperm in semen. Sperm concentration is measured during a semen analysis, which evaluates a sample…
Ophthalmology
Diagnosis and treatment for eye conditions, from cataracts and glaucoma to vision correction.
Oral Cancer
Oral cancer, also called mouth cancer, is cancer that begins in tissues of the mouth or nearby throat. It can affect the…
Oral Leukoplakia
Oral leukoplakia is a persistent white patch or plaque that develops on the moist tissues inside the mouth. It commonly appears on…
Orthopedics and Traumatology
Diagnosis and treatment for bone, joint, and muscle conditions, from fractures to joint replacement.
Osteoarthritis
Osteoarthritis is a progressive joint disease in which cartilage and other joint tissues gradually change and become damaged. It most often affects…
Osteochondritis Dissecans
Osteochondritis dissecans occurs when a small area of bone beneath the cartilage at a joint loses part of its blood supply. The…
Osteochondroma
Osteochondroma is a cartilage-capped bony projection that grows from the surface of a bone. It often develops during childhood or adolescence, while…
Osteoid Osteoma
Osteoid osteoma is a benign, usually small bone-forming tumor. It most often affects adolescents and young adults. The tumor commonly develops in…
Osteoporosis
Osteoporosis is a disease that makes bones less dense and weaker than they should be. In osteoporosis, bones become more porous and…
Other Disorders Of Glucose Regulation Or Pancreatic Internal Secretion
Other disorders of glucose regulation or pancreatic internal secretion are less common conditions that affect how the body controls blood glucose or…
Otitis Media
Otitis media is inflammation or infection in the middle ear, the space behind the eardrum. It may involve an active infection or…
Ovarian Cancer
Ovarian cancer is the uncontrolled growth of abnormal cells in or around an ovary. Several tumor types can develop from different cells…
Ovarian Cyst
An ovarian cyst is a fluid-filled sac or other growth that develops in or on an ovary. Many cysts are benign, meaning…
