Crying at one time and laughing at another is a symptom that shows moodiness and unpredictability. There are several possibilities depending on the symptoms, the first being the rapid cycling type of bipolar disorder. This symptom causes the patient to alternate between high and low moods, and the transition is very rapid. It is possible that the patient may experience a depressed mood half an hour ago, feeling that life is meaningless, or even developing negative perceptions and wanting to hurt themselves. The patient may be sad and crying, but after a while, he or she may suddenly become more emotional, feel more empowered, and laugh. There is another possibility seen in schizophrenia, where similar symptoms may occur under the control of psychotic symptoms. For example, if you suddenly have delusions that you have won big money or that good news will appear, you will laugh out loud at this time. However, it is possible to hear voices that criticize you or to have bizarre thoughts. For example, if you are convinced that your family will suffer a disaster or danger, you may cry again. Also patients with schizophrenia have disorders of mood, emotion, and volitional behavior. So there may be emotional inversions, so they show emotional instability and moodiness.