Aggressive behaviour should be considered as the feedback in relation with the health condition of society. Aggression may be considered as instinct behaviour or acquired social behaviour. If we are studying the theory of aggressive behaviour, we should take into consideration psychosocial and biological features, the influence of neurotransmitters: seratonin, dopamine and some biochemical markers just like the level of cholesterol, troigliceroids and testosterone. Aggressive behaviour, physical and mental violence has negative influence on physical health, fitness and efficiency. Fright, depression, psychosis and isolation are the irreparable changes in a man's psyche. Autoaggressive behaviours: selfhurting, suicide attempts and committed suicides are external forms of aggression. The suicide rate shows the level of physical and mental health of society. The higher the suicide rate is, the worse the state of health is. 20 per cent of Polish patients are those with autodestructive behaviours. They are treated because of psychical disorders. They are treated because of mental disorders. The state of health, and stress cause social and family isolation. These lead to depression and somatic diseases, like blood circling, breathing and digestive disorders. Violence in family, murders are often result of mental disorders, unbalanced psyche or alcoholism, diseases of nervous system. II person often becomes aggressive because he wants to relieve his emotions caused by bad health condition.