Pregnancy can cause teeth clenching for various reasons. First, hormonal changes during pregnancy can cause a woman to feel more anxious and stressed, leading to teeth clenching. Additionally, the physical changes that occur during pregnancy, such as an increase in belly size, can make it difficult to get comfortable at night, leading to teeth clenching. Pregnancy can also cause [simple_tooltip text=sleep apnea tooltip=A disorder where a persons breathing is repeatedly interrupted during sleep, leading to poor sleep quality and daytime fatigue ], which can also lead to teeth clenching, notes Dr. Goldstein