Grumpy after pregnancy is formed by a number of reasons: First, after pregnancy, the body estrogen and progesterone greatly increased, the body androgen reduced, androgen has a stabilizing effect on the mood, from the perspective of hormonal changes can easily cause grumpy. The change of human chorionic gonadotropin in the body after pregnancy will cause nausea, vomiting, dizziness, weakness and other pregnancy reactions, and some women will experience gastrointestinal discomfort such as vomiting or hunger at night, which will affect the normal sleep and make the quality of sleep drop or insomnia, which will also affect the normal mood and cause temper change. Third, the psychological pressure increases after pregnancy, too worried about the growth and development of the baby’s health, worry about fetal deformities and pain during childbirth, these pressures will also aggravate the mood irritability.