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.
Unresolved anger issues lead to anxiety, which can have long-term effects on your life. Immediate effects of anxiety might include dizziness, rapid breathing, nausea, muscle pain, muscle tension, headaches, and problems with concentration and memory.