A negative emotion is that type of emotion which causes us to react negatively towards others or towards our self. It is either due to inherent weakness in our system or due to  beliefs and lifestyle. They are very damaging. And sometimes we appear incapable of controlling them. Some of these are: Anger,  Anxiety, Depression and Sadness,  Fears and Phobias, including fear of public speaking, fear of heights, fear of flying, and fear of rejection, cause you Grief, Guilt. Medical fact confirms that negative Emotion Trigger varying chemicals in our body for flight, fight, or freeze response. Negative Emotion can kill you, as it causes physical ailments, and psychological disabilities which cause stress,  and do lead to medications the body does not need, it can lead to issues such as: Addictive Cravings, including food, cigarettes, alcohol, and drugs, make you susceptible to Allergies -including food, environmental., chemical, and Panic Attacks etc. It can cause you Insomnia, breathing difficulties, make you overweight, make children develop issues such as bedwetting, Compulsions and Obsessions, bad Habits such as Nail Biting, loose concentration, perform poorly at tasks, loose focus, etc.