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Drugs and diseases reference index

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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «O»:

  1. Ophthalmoscopy Ophthalmoscopy
    Ophthalmoscopy is an examination of the back part of the eyeball (fundus), which includes the retina, optic disc, choroid, and blood vessels. How the Test is Performed There are different types of ophthalmoscopy. Direct ophthalmoscopy Indirect ophthalmoscopy Slit-lamp ophthalmoscopy Direct ophtha...
  2. Opiate withdrawal Opiate withdrawal
    Opiate withdrawal refers to the wide range of symptoms that occur after stopping or dramatically reducing opiate drugs after heavy and prolonged use (several weeks or more). Opiate drugs include heroin, morphine, codeine, Oxycontin, Dilaudid, methadone, and others. Causes About 9% of the population...
  3. Opioid intoxication Opioid intoxication
    Opium and its forms (which include morphine, heroin, oxycodone, and the synthetic opioid narcotics) lead to an abnormal mental state, which generally involves excessive sleepiness or unconsciousness. Causes In the United States, the most commonly abused opioids are heroin and methadone. Symptoms Sy...
  4. Opisthotonos Opisthotonos
    Opisthotonos is a condition in which the body is held in an abnormal posture. It usually involves rigidity and severe arching of the back, with the head thrown backward. If a person with opisthotonos lays on his or her back, only the back of the head and the heels would touch the supporting surface....
  5. Oppositional defiant disorder Oppositional defiant disorder
    Oppositional defiant disorder is a pattern of disobedient, hostile, and defiant behavior toward authority figures. Causes This disorder is more common in boys than in girls. Some studies have shown that it affects 20% of school-age children. However, most experts believe this figure is high due to ...
  6. Optic glioma Optic glioma
    Gliomas are tumors that grow in various parts of the brain. Optic gliomas can affect: One or both of the optic nerves, which carry visual information to the brain from each eye The optic chiasm, the area where the optic nerves cross each other in front of the hypothalamus of the brain An optic gli...
  7. Optic nerve atrophy Optic nerve atrophy
    Optic nerve atrophy is damage to the optic nerve. The optic nerve carries images of what we see from the eye to the brain. Causes There are many unrelated causes of optic atrophy. The most common cause is poor blood flow, called ischemic optic neuropathy, which most often affects elderly people. Th...
  8. Optic neuritis Optic neuritis
    Optic neuritis is inflammation of the optic nerve. It may cause sudden, reduced vision in the affected eye. Causes The cause of optic neuritis is unknown. Sudden inflammation of the nerve connecting the eye and the brain (optic nerve) can injure the insulation (myelin sheath) surrounding each nerve...
  9. Oral cancer Oral cancer
    Oral cancer is cancer of the mouth. Causes Oral cancer most commonly involves the tissue of the lips or the tongue. It may also occur on the: Cheek lining Floor of the mouth Gums (gingiva) Roof of the mouth (palate) Most oral cancers look very similar under the microscope and are called squam...
  10. Oral cholecystogram Oral cholecystogram
    Oral cholecystogram is an x-ray of the gallbladder, an organ in the right upper abdomen that stores bile. The x-ray is taken before the gallbladder releases bile. How the Test is Performed The test is done in a hospital radiology department or in the health care provider's office by an x-ray techni...
  11. Oral hypoglycemics overdose Oral hypoglycemics overdose
    Oral hypoglycemic pills are a class of prescription medications used to control diabetes. Oral means "taken by mouth." There are many different types of oral hypoglycemics. This article focuses on a class called sulfonylureas. An overdose occurs when someone accidentally or intentionally takes more ...
  12. Oral mucositis Oral mucositis
    Radiation therapy or chemotherapy may cause mucositis (tissue swelling) in your mouth. You may have any of these symptoms: Mouth pain Mouth sores Infection Bleeding, if you are getting chemotherapy. Patients getting radiation therapy usually do not have bleeding. In patients getting chemotherapy, ...
  13. Orbit CT scan Orbit CT scan
    A computed tomography (CT) scan of the orbit is an imaging method that uses x-rays to create detailed pictures of the eye sockets (orbits) and eyes (globes). See: CT scan How the Test is Performed A special dye, called contrast, may be injected into your hand or forearm before the test starts. Con...
  14. Orbital pseudotumor Orbital pseudotumor
    Orbital pseudotumor is a swelling of the tissues behind the eye in an area called the orbit. The orbit is the bony cavity in the skull where the eye sits. It protects the eyeball and the muscles and tissue that surround it. Unlike cancerous tumors, an orbital pseudotumor does not spread to other tis...
  15. Orchitis Orchitis
    Orchitis is swelling (inflammation) of one or both of the testicles. Causes Orchitis may be caused by an infection from many different types of bacteria and viruses. It is usually a result of epididymitis, inflammation of the tube that connects the vas deferens and the testicle. The most common vir...