Table 2.

Types/Levels of oxidative stress.

Oxidative Stress	Definition	Reference
Acute	The inability of cells to neutralize enhanced ROS level over a period of time, such that the time is enough to result in specific physiological consequences.	[20,21,22,23]
Chronic	It occurs when acute oxidative stress progresses to significantly disturb homeostasis. Here, the ROS levels are elevated and very stable, and very potent in altering healthy cell components.	[20]
Quasi-stationery	It occurs when ROS levels are so elevated that it is almost impossible to return to ideal homeostatic levels, thus resulting in the need for a substantial reorganization of the entire homeostatic system.	[22,23]