Always spitting in the third trimester of pregnancy may be caused by elevated estrogen levels in the body after pregnancy, irrational diet, mental stress and other reasons. 1. Elevated levels of estrogen in the body: elevated levels of estrogen in the body during the third trimester of pregnancy inhibit gastrointestinal function, leading to gastrointestinal function, long periods of time without food may appear to have more gastric acid secretion, spitting situation. 2. Irrational diet: eating too much high-fat, high-sugar, greasy food in the third trimester of pregnancy may aggravate the pregnancy reaction and spitting, you can improve the daily diet. 3. mental tension: pregnant women in the third trimester of pregnancy mental tension, often in a state of fear, may appear involuntary spitting. The third trimester of pregnancy is always spitting, pregnant women should pay more attention to rest, maintain a relaxed mood, moderate daily consumption of fruits and vegetables, soy products, high-protein foods, regular pregnancy checkups. If the spitting situation is serious, you can consult a doctor for a clear diagnosis, under the guidance of the doctor to improve the condition.