If a person's serotonin level decreases, so will his or her ability to fight stress, the site says. Noradrenaline gives the body energy. If a person's noradrenaline levels are low he or she will feel exhausted, lethargic, and without energy. All the person wants to do is sit, the site says. High stress levels affect a person's energy level, thereby affecting his or her noradrenaline levels.
Dopamine sets a person's pleasure and pain levels.
It is concentrated in the same area of the brain as endorphins, the chemicals that regulate how much pain a person can tolerate, the site says. When the endorphin levels are down, a person cannot tolerate high levels of pain. When dopamine levels decrease, so do endorphin levels, the site says. When stress gets in the way of a person's enjoyment of life, the dopamine levels decrease, and things that used to be fun for the person now seem uninteresting, the site says. The site suggests several things a person can do to help reduce stress on his or her own.