What its made of and not on what it does
Stress -
Stress is the feeling of being overwhelmed or being unable to cope with mental pressure.
Depression:
Depression symptoms are persistent sadness or loss of interest. There can also be changes in sleep schedule, appetite, energy levels, concentration, self-esteem and daily behavior.
Anxiety:
Anxiety symptoms are feeling nervous/restless, having a sense of sudden panic or doom, having an increased heart rate, sweating/trembling, and feeling weak or tired.
Bereavement (grief). <span>Bereavement is the state of loss when someone close to you has died. The death of someone you love is one of the greatest sorrows that can occur. Feelings of bereavement can also accompany other losses, such as the decline of your health or the health of someone you care about, or the end of an important relationship. </span>