Level 1: Reasons why pregnant women get angry There are many reasons why pregnant women get angry, including improper diet, mood swings, climate change, etc. Due to endocrine changes in the body and the needs of the fetus, pregnant women\’s demand for nutrients and energy will increase. If improper diet leads to overnutrition or lack of nutrition, it will cause internal heat. In addition, high mood swings and high stress during pregnancy can easily lead to anger. Climate change is also an important reason. Staying in a summer or humid environment for a long time can easily cause you to get angry. Level 2: Symptoms of pregnant women getting angry. The main symptoms of pregnant women getting angry include mouth.