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Concept (from Wikipedia)
Sadness, that feeling of heavy-heartedness, is emotional pain associated with or characterized by feelings of disadvantage, loss, despair, helplessness, disappointment and sorrow. An individual experiencing sadness may cry or become quiet or lethargic, and withdraw themselves from others.
Anger or wrath is an intense emotional response. Often it indicates when one's basic boundaries are violated. Some have a learned tendency to react to anger through retaliation. Anger may be utilized effectively when used to set boundaries or escape from dangerous situations.
Sheila Videbeck describes anger as a normal emotion that involves a strong uncomfortable and emotional response to a perceived provocation. Raymond Novaco, of UC Irvine, who since 1975 has published a plethora of literature on the subject, stratified anger into three modalities: cognitive (appraisals), somatic-affective (tension and agitations), and behavioural (withdrawal and antagonism).