Vega
Vega literally mean urge or impulse. In physiology, Vega are the urges that occur naturally in the body to expel metabolic waste products like urine, feces, flatus etc. and as a reaction of the body at certain times such as belching, yawning, sleep etc. to ensure comfort. Urge is a strong impulse to do something urgently.
In disease pathology, the term vega means acute onset or episode of disease. Example Jwara vega, Apasmara vega