Typically it is said when listening to someone talking-- it is a polite way to let them know that you are paying attention. Think of it as going 'mm' or 'ah'.
In addition stress can have direct effects on the skin (rashes, hives, atopic dermatitis, the gastrointestinal system (GERD, peptic ulcer, irritable bowel syndrome, ulcerative colitis) and can contribute to insomnia and degenerative neurological disorders like Parkinsonâs disease.
New research suggests that our response to stress may at times be overexaggerated because of the evolutionary development of the brain linking emotional responses to perceptions of stress. As a result, mildly stressful situations can affect our perceptions in the same way as life-threatening ones. In the study, researchers studied the effects of money loss â a stressful event for most everyone. Money loss, real or perceived, can cause significant outcomes as financial loss can lead to irrational behavior.