Irritation or exacerbation, in biology and physiology, is a state of inflammation or painful reaction to allergy or cell-lining damage. A stimulus or agent which induces the state of irritation is an irritant. Irritants are typically thought of as chemical agents (for example phenol and capsaicin) but mechanical, thermal (heat), and radiative stimuli (for example ultraviolet light or ionising radiations) can also be irritants. Irritation also has non-clinical usages referring to bothersome physical or psychological pain or discomfort.
Chronic irritation is a medical term signifying that afflictive health conditions have been present for a while. There are many disorders that can cause chronic irritation, the majority involves the skin, vagina, eyes and lungs.
Read more about Irritation: Irritation in Organisms
Famous quotes containing the word irritation:
“The Troubles are a pigmentation in our lives here, a constant irritation that detracts from real life. But life has to do with something else as well, and it’s the other things which are the more permanent and real.”
—Brian Friel (b. 1929)