(From to be uneasy, anxious). Anxietas, anxiety. Hippocrates uses it to express that restless uneasiness that is attendant on acute diseases. Duretus distinguishes between the and the The first is caused by an oppression of the vital powers; the latter by sickness in the stomach; but of this last alysmos, called also diaporema and aporia, there are reckoned four sorts.

The 1st and 2d of which are without, the 3d and 4th with fever; and occasioned, 1st, By something uneasy in the stomach, producing an irregular contraction of the heart, and a difficult passage of the blood through the lungs. Uneasiness of the stomach by sympathy, as from a stone in the kidneys, etc. produces this disorder.

2d, By vapours or spasms in the stomach, or other viscera; as in the cholera morbus, hysteria, etc.

3d, From a difficulty in the passage, of the blood through the lungs, which may be from a spasmodic stricture in the smaller vessels, in which case the blood is confined to the larger. In inflammatory fevers, this symptom is attended with a low pulse, oppression in the breast, and difficult breathing.

4th, From a stricture of the vena portae, which prevents a free circulation of the blood in the lower belly. In this case there is great weight and oppression of the hypochondria.