The main reasons for the sudden desire to cry may be the following: 1. There may be depressive moods, such as depressed moods, unhappy, even sensitive, suspicious, low self-esteem, self-blame, self-guilt, pessimism and disappointment for the future, and no hope. If there are such symptoms, it may be a depressed mood. If it is longer and lasts for more than two weeks, you should also consider whether there is a problem of depression. 2, may be encountered social stress factors, such as the current pressure is relatively high, facing problems such as high school entrance exams, marriage or the death of family members, breakups, etc., may appear aggrieved, unhappy, depressed, nervous, sensitive and other emotional problems, and in serious cases may cause stress reactions. 3, may be a serious traumatic reaction, such as currently facing a very serious event, such as an earthquake, fire, car accident, etc. If it is a very serious traumatic event, it is easy to have a sudden desire to cry, collapse or even unstable temper, etc. The above are the more common reasons.