All negative emotions arise from negative thinking,  negative memory about the past or negative imagination  about  future (hatred, anger, hostility, frustration, anxiety, depression, sad, suspicuous, protective,doubt, fear, worry, guilt, loss of hope) generate stress hormones, activate sympathetic system, psychoneuroimmune system, endocannabinnoid system, and  is culmulative, detrimental to present and future  personal physical, psychological and social health.

       Negative emotion is directly contagious to surrounding people and even next layers of people, damaging other's physical, psychological and social health.

       If you like positve people, are you spreading negative thoughts?