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    Anxiety disorders in which the essential feature is persistent and irrational fear of a specific object, activity, or situation that the individual feels compelled to avoid. The individual recognizes the fear as excessive or unreasonable.


A psychological and/or biological response to stress. Feelings of anxiety involve discomforting apprehension or concern, which may include symptoms such as cognitive difficulties, hypersensitivity, dizziness, muscular weakness, breathing difficulties, irregular heart beat, sweating, and sensations of fear. Typically, anxiety is a natural and healthy response to life experiences. However, exaggerated or chronic anxiety often indicates an anxiety disorder. Anxiety can be produced by external stress (exogenous anxiety) or internal stress (endogenous anxiety).

1. Something that cannot be done without. 2. Required in the diet, because the body cannot make it. As in an essential amino acid or an essential fatty acid. 3. Idiopathic. As in essential hypertension.

The affective response to an actual current external danger which subsides with the elimination of the threatening condition.


An anxiety disorder that is characterized by an intense and, at least on the surface, irrational fear.


A triangular membrane with blood vessels which grows from the sclera toward the occasionally onto the cornea. It occurs more often on the nasal side of the eye. It is more common in dusty and windy climates. Surgery is often necessary.

A drooping of the upper eyelid. In children it is usually a congenital problem. It rarely causes amblyopia. Most children simply hold their heads back if the droop is severe. Surgery, the only treatment, is usually suggested prior to starting school when the appearance is cosmetically unacceptable.

A circular opening in the center of the iris. The size of the pupil changes according to the amount of light present. It is small in sunlight and large in a dark room.

Paroxetime: a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Paxil).

Psoriasis treatment
A particular set of medical actions and interventions aimed at fighting a patient's psoriasis condition.


An acute infectious disease of humans, particularly children, caused by any of three serotypes of human poliovirus. Usually the infection is limited to the gastrointestinal tract and nasopharynx, and is often asymptomatic. The central nervous system, primarily the spinal cord, may be affected, leading to rapidly progressive paralysis, coarse fasciculation and hyporeflexia. Motor neurons are primarily affected. Encephalitis may also occur. The virus replicates in the nervous system, and may cause significant neuronal loss, most notably in the spinal cord. A rare related condition, nonpoliovirus poliomyelitis, may result from infections with nonpoliovirus enteroviruses.

Polycystic ovary syndrome
Clinical symptom complex characterized by oligomenorrhea or amenorrhea, anovulation, and regularly associated with bilateral polycystic ovaries.

Postnatal Depression
Depression in women occurring usually within four weeks after the delivery of a child. The degree of depression ranges from mild transient depression to neurotic or psychotic depressive disorders.

Pott's disease
Tuberculosis affecting the spine.

An antibody combining site that is complementary to an epitope.

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