A recent illness with rapid onset.

A serious illness such as a heart attack or stroke that develops rapidly with pronounced symptoms. The illness can be of short duration such as influenza.

a short sharp illness and a chronic illness is one that lasts a long time, sometimes coming and going

Illness or condition characterized by sudden onset or marked symptoms

An illness that is curable, i.e the illness can be treated to a point where you are returned to your medical health condition prior to the illness occurring.

An illness that is usually short-term and that often comes on quickly.

A physical condition or illness that begins abruptly and requires medical care or restricted activity for a short period of time (usually 3 months or less).

A disease with an abrupt onset and usually a short course.

Illness that occurs suddenly over a short time.

is one which the onset is rapid and the symptoms are severe and the patient usually recovers fairly quickly.