There is an intermediate transition zone between the two poles of envy and jealousy. We may call this middle zone “envy”. Metaphorically speaking, envy is sweet, jealousy has a sour taste, and jealousy is bitter. The objective root of these three emotions is the same, that is, there is competition in society and people taste different tastes in the competition. The envious person can clearly see that he is inferior to others but does not have an inferiority complex. In envy, he experiences a sharing or spiritual uplift, which inspires him to learn from others or make constructive compensatory efforts. The envious person is more or less inferior, he is aware of this, but not frustrated, he has a strong competitive mind and also has the corresponding practical action, in frustration or failure, of course, inevitably complained or involved in anger, or even pointed at the lucky person. The jealous person’s competitive spirit is not obvious or even absent, but a strong inferiority complex is strongly suppressed, and he is suspicious and distrustful of people, especially those who seem more fortunate than him. He is tense and almost ready to explode into hatred, revenge and destruction. These emotions exist for ordinary people as well, when it comes to mental disorders. The jealousy seen in mental disorders is almost exclusively limited to sexual jealousy. Since jealousy is a destructive emotion, fishy days are not far away whenever it finds its way to the door. Jealousy includes understandable jealousy (which normal people can have) and pathological jealousy (which is only found in psychological disorders). This article focuses on pathological jealousy. Pathological jealousy means that the patient is often in conflict with his spouse due to unfounded speculations, which seriously hinders the normal life and work of both parties. The jealous person will use many ways to test and scout his spouse, and he also admits that there is always no conclusive evidence, but believes that there is no need for definite evidence, and even explains that such evidence is difficult to obtain. Jealousy of spousal infidelity is significantly more common in women than in men, and severe jealousy, even to the point of pathological jealous delusions, is significantly more common in men than in women. Severe jealousy, jealousy for no reason, jealousy that is impossible but insists on the truth, incomprehensible prejudice, is the product of a disease process and is a symptom of a psychological disorder. The most common cases are seen in schizophrenia, chronic alcoholism and persistent delusional disorder. In a few cases, the patient seems to have recovered completely after hospitalization and other treatments, and the patient no longer holds onto his or her opinions or sings about his or her lover’s infidelity all day as usual. In fact, the patient still secretly retains his jealousy in his heart, but they know that if they speak out, they will be regarded as pathological, so they keep their mouths shut and do not show it in their lives and in their dealings with others.