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Common Symptoms:
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Diseases and Medical Conditions M-O provides down-to-earth, comprehensive definitions of hundreds of ailments and illnesses beginning with the letters M-O. Each listing identifies causes, incidence and risk factors, notes symptoms, outlines tests and discusses treatments and support groups where applicable.
Featured Article: Obsessive-compulsive Disorder
Obsessive compulsive disorder (OCD) is an anxiety disorder where a person performs tasks to relieve obsessions. Learn about obsessive compulsive disorder symptoms, tests and treatments. See more »
Orchitis
Orchitis is an inflammation of one or both of the testicles. Learn about orchitis causes, symptoms, treatment and prevention.
See more »Organic Brain Syndrome
Organic brain syndrome refers to any physical disorder that cause decreased mental function. Learn about organic brain syndrome causes, symptoms, treatment and prevention.
See more »Osgood-Schlatter Disease
Osgood-Schlatter disease is a painful swelling of the anterior tibial tubercle. Learn about Osgood-Schlatter disease causes, symptoms, treatment and prevention.
See more »Osler-Weber-Rendu Syndrome
Osler-Weber-Rendu syndrome is a blood vessel disorder which can cause excessive bleeding. Learn about Osler-Weber-Rendu syndrome causes, symptoms, treatment and prevention.
See more »Osmotic Diuresis
Osmotic diuresis is excessive urination due to substance presence in the kidney tubules. Learn about osmotic diuresis causes, symptoms, treatment and prevention.
See more »Osteitis Fibrosa
Osteitis Fibrosa information from HowStuffWorks. Learn about causes, symptoms and treatments of Osteitis Fibrosa.
See more »Osteogenesis Imperfecta
Osteogenesis Imperfecta information from HowStuffWorks. Learn about causes, symptoms and treatments of Osteogenesis Imperfecta.
See more »Osteomalacia
Osteomalacia is bone softening from vitamin D metabolizing or deficiency. Learn about osteomalacia causes, symptoms, treatment and prevention.
See more »Osteomyelitis
Osteomyelitis is an acute or chronic bone infection often caused by bacteria. Learn about osteomyelitis causes, symptoms, treatment and prevention.
See more »Osteopenia - Premature Infants
Osteopenia - premature infants is bone weakness and brittleness in premature infants. Learn about premature infant osteopenia causes, symptoms, treatment and prevention.
See more »Osteoporosis
Osteoporosis is bone density loss and bone tissue thinning over time. Learn about osteoporosis causes, symptoms, treatment and prevention.
See more »Osteosarcoma
Osteosarcoma is a bone tumor often developing during adolescent maturity. Learn about osteosarcoma causes, symptoms, treatment and prevention.
See more »Otitis
Ear infection or otitis is any disorder infecting or impairing ear functions. Learn about ear infection causes, symptoms, tests, treatment and prevention.
See more »Otitis Media - Chronic
Chronic otitis media is a recurring infection or inflammation of the middle ear from Eustachian tube blockage. Learn about chronic otitis media causes, symptoms, tests, treatment and prevention.
See more »Otitis Media With Effusion
Otitis media with effusion (OME) is middle ear inflammation and fluid build up without acute infection symptoms. Learn about OME causes, symptoms, treatment and prevention.
See more »Otosclerosis
Otosclerosis is an abnormal bone growth in the middle ear that causes hearing loss. Learn about otosclerosis causes, symptoms, treatment and prevention.
See more »Ovarian Cancer
Ovarian cancer is a malignant tumor on the ovaries. It occurs mainly in women between 55 and 74 years of age. Learn about ovarian cancer symptoms, tests and treatments.
See more »Ovarian Cancer Dangers
Ovarian cancer dangers are due to the lack of symptoms manifesting until late in the disease process when the cancer has spread beyond the ovaries. Learn more about ovarian cancer dangers and risk factors.
See more »Ovarian Cysts
Ovarian cysts are fluid or semisolid filled sacs forming on or inside the ovary, no risk factors are known. Learn about ovarian cysts symptoms, tests and treatments.
See more »Ovarian Hypofunction
Ovarian hypofunction or premature ovarian failure is reduced ovarian function. Learn about ovarian hypofunction causes, symptoms, treatment and prevention.
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