Whether or not blood in the sputum of pregnant women will affect the fetus needs to be analyzed in relation to the specific cause of the disease. However, regardless of the cause, it is recommended to consult a doctor in a timely manner, clear treatment, so as not to delay the condition of the fetus to cause adverse effects.1, chronic pharyngitis / upper respiratory tract infection: generally dry throat, throat itching, cough and other symptoms, coughing, when the coughing is intense, may lead to local capillary rupture, resulting in sputum with blood in the sputum of the case, which will generally not affect the fetus. If the infection is further aggravated, high fever and other systemic symptoms, may affect the fetus, such as causing miscarriage; 2, bronchiectasis: some pregnant women have a history of bronchiectasis, bronchiectasis is a typical symptom of recurrent coughing, coughing up sputum, coughing up blood, it is very easy to combine with infection. If coughing up blood is more, it may cause severe anemia in pregnant women. Anemia in pregnant women can cause a decrease in the oxygen-carrying capacity of the blood, leading to fetal hypoxia in the uterus; 3. Tuberculosis: Tuberculosis itself is a contagious disease, and Mycobacterium tuberculosis will be spread through the bloodstream and enter the fetus through the placenta, causing congenital tuberculosis. In addition, the use of anti-tuberculosis drugs during pregnancy will have an adverse effect on the fetus, such as the commonly used anti-tuberculosis drug isoniazid, may pass through the placenta, leading to fetal malformations or cause fetal cerebral nerve damage, deafness, etc.; 4, lung tumors: if a pregnant woman has a malignant tumor of the lungs, this is itself a consumptive disease, which will lead to a decline in maternal organism, the pregnant woman herself may be malnourished, hypoxia and so on, directly affecting the supply of the fetus. Directly affect the supply to the fetus, resulting in intrauterine growth retardation, intrauterine hypoxia, etc..