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Medical glossary

227 words and abbreviations, explained without jargon. Every one of them also appears inside our articles — hover or tap the dotted underline and the definition comes to you, so you never have to leave what you were reading.

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ObsessionObsessions, Obsessive thoughtsIn psychology, an unwanted thought, image or urge that keeps returning and causes anxiety — not an intense interest. Obsessions are one half of obsessive-compulsive disorder.
Obsessive-compulsive disorderOCD, Obsessive compulsive disorderA condition in which unwanted, distressing thoughts keep returning and the person feels driven to repeat actions or mental rituals to ease the distress.
Oedema

Edema, Fluid retention, Swelling

Oedema is swelling caused by fluid collecting in the tissues, most often seen in the ankles and legs. It is a sign rather than a diagnosis, and what matters is the reason behind it.

Oral glucose tolerance testOGTT, Glucose tolerance test, GTTA test where you drink a measured sugary solution and have your blood sugar checked two hours later, to see how well your body clears it.

Oral rehydration solutionORS, Oral rehydration salts, NimkolOral rehydration solution is a precise mixture of salts and glucose in water that replaces what the body loses in diarrhoea and vomiting. The glucose is what allows the salt and water to be absorbed, which is why plain water or a soft drink does not do the same job.

OsteoarthritisOA, Degenerative joint disease, Wear-and-tear arthritisOsteoarthritis is the gradual loss of the smooth cartilage that lines a joint, leaving stiffness and pain that is worse with use. It is the most common form of arthritis and usually affects knees, hips, hands and the spine.

OsteoporosisBrittle bone disease, Thin bonesOsteoporosis is loss of bone density that leaves bones fragile enough to break from a minor fall or even a cough. It causes no symptoms until a fracture happens, which is what makes it dangerous.

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Health, explained plainly. Written for Pakistan and checked by the clinic’s doctors before it is published.

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Aslam Clinic & Al-Shifa Laser Eye Center, Mohalla Masjid Siddique, Circular Road, Jalalpur Jattan

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