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.
Short-Term and Long-Term Effects of PTSD. Post-traumatic stress disorder causes short-term memory loss and can have long-term chronic psychological repercussions, according to the American Psychological Association (APA) and the NCBI.