Sore throat in early pregnancy may be caused by viral and bacterial infections or external stimuli. Infection may have a certain effect on the fetus, external stimulation generally has no effect on the fetus. 1. Viral or bacterial infections: parainfluenza virus, adenovirus, measles virus, streptococcus, staphylococcus, etc. can cause upper respiratory tract infections, resulting in symptoms such as sore throat. When the infection symptoms are mild, without systemic reaction, fever and other symptoms, most of them have no obvious effect on the fetus; if the infection symptoms are severe, causing high fever and other conditions may lead to miscarriage, fetal malformation and so on. 2. External stimuli: dry weather, breathing through the mouth, eating irritating food and other reasons can cause pregnant women with sore throats, avoid stimulation, drink more water after the sore throat symptoms can be relieved, most of the fetus has no adverse effect. Early pregnancy sore throat should be timely consultation, under the guidance of the doctor to identify the causes, give appropriate treatment. Do not use drugs privately, so as not to cause the fetus or pregnant women adverse prognosis.