Rumination is not necessarily a mental illness, but may also be a normal psychological and emotional reaction. When experiencing a relatively large stressful event, such as earthquakes, natural disasters and severe tests, it is possible to have more divergent thinking, more thinking, and some of these distractions, panic and fidgeting. It may be a normal stress reaction, there will be anxiety. If the patient’s ruminations are uncontrolled for a long time and also affect sleep, daily life, study, work, and social activities, he or she may be suffering from a mental illness, commonly known as this anxiety disorder, depression, schizophrenia, etc.