Bad mood after pregnancy may be related to a variety of factors, including endocrine factors, psychological factors, other factors and so on. 1. Endocrine factors: the endocrine changes in the mother’s body after conception, estrogen and progesterone levels rise, which can cause changes in the personality and mood of pregnant women, which can be manifested as irritability, anxiety, suspicion, nervousness and other bad moods. 2. Psychological factors: most pregnant women may be overly nervous about the fetus, or more worried about other things, thus showing tension, fear, anxiety and other bad emotions. 3. Other factors: It may be due to the unsupportive family members, poor surrounding environment, etc., which affects the mood of pregnant women. Pregnant women often have bad moods during pregnancy, which requires timely adjustment by the pregnant woman as well as support from her family to relieve tension and other bad moods. Maintaining a healthy, positive and optimistic state of mind will help the pregnant woman get through the pregnancy smoothly and will also be conducive to the normal development of the fetus.