In describing a medical condition, the word “acute” indicates that it is new, recent, or of sudden onset. Doctors use the term for problems that develop quickly, such as acute appendicitis, acute pain, or an acute infection. It is commonly contrasted with “chronic,” which generally describes a condition that persists over a long period.
Acute does not automatically mean extremely severe. An acute condition may be mild or serious; the core idea is its timing and course. For example, a sudden ankle sprain can be acute, while a long-standing condition such as arthritis can be chronic. A chronic illness can also have an acute flare-up.
The word comes from the Latin acutus, meaning “sharp” or “pointed,” which explains why it can also describe sharp pain or a sudden change. In healthcare, “acute care” refers to short-term treatment for illness, injury, or recovery, usually in settings such as hospitals and urgent-care facilities.