The symptoms of white and thick tongue during pregnancy are mostly caused by poor oral hygiene. Due to vomiting or physical discomfort during pregnancy, pregnant women do not brush their teeth and rinse their mouths carefully, resulting in food residues and bacteria on the surface of the teeth and tongue, which can lead to a white and thick tongue and bad breath. In addition, when women are pregnant, many will have digestive disorders, due to gastrointestinal digestive malfunction, causing food in the digestive process of obstacles resulting in long-term food accumulation, food accumulation in the stomach for a long time will cause stomach fire, fire to the inside of the mouth will cause the phenomenon of white and thick tongue coating. Many women suffer from iron deficiency anemia during pregnancy, which can also cause white tongue, along with white lips and white eyelids and nails.