Wheezing in pregnancy may be caused by physiological factors or pathological factors such as anemia in pregnancy, hypertension in pregnancy and other diseases. 1. Physiological factors: usually during pregnancy, with the gradual development of the fetus, the uterus will increase in size, the position of the enlarged uterus will move upward, easy to squeeze the diaphragm, indirectly squeezing the heart and lungs, resulting in the phenomenon of breathlessness. This is a physiological phenomenon, generally do not need special treatment, patients can relieve the symptoms after appropriate rest. 2. Pathological factors: during pregnancy, some patients may suffer from pregnancy anemia or pregnancy hypertension, etc. If the condition is serious, it will lead to symptoms such as chest tightness and breathlessness. Patients need to actively treat the primary disease to relieve the symptoms of shortness of breath. There may be other causes of breathlessness in pregnancy, and patients are advised to actively seek medical treatment to avoid delaying the condition.