Conditions

Dandruff is scale from the scalp shedding faster than normal. It is not caused by poor hygiene or by dryness, as is commonly assumed: in most cases there is…

Deafblindness is the combination, in one person, of hearing loss and sight loss. Reports and translations also call it dual sensory loss or multisensory…

Deep vein thrombosis is a blood clot in a deep vein, most often in the calf or thigh and less often in the arm.

Dehydration is not an illness in itself but a state: the body has lost more water and salt than it has taken in.

Dementia is not one illness but an umbrella term for conditions in which memory, thinking, language and the ability to manage everyday life gradually decline.

Dengue is caught in one way only, from the bite of a mosquito; it does not pass from person to person.

An abscess is a pocket of pus that bacteria have made inside a tooth, in the bone beside its root, or in the gum.

Diabetes is a group of conditions that share one feature: too much glucose in the blood. It is not a single disease.

Diabetes insipidus is an uncommon condition in which the kidneys stop holding on to water.

Ketoacidosis is where a shortage of insulin ends up when nobody notices it in time. Glucose stops reaching the cells, the body falls back on burning fat, and…