There are more reasons for frequent contractions at 29 weeks of pregnancy, including physiological and pathologic causes such as preterm labor. 1. Physiological: In the late stages of pregnancy, the phenomenon of contractions usually occurs, the frequency of contractions at this time is not fixed, and the degree is not strong. They are usually caused by over-exertion of the pregnant woman or cold or cold food intake, which is a normal physiological phenomenon. 2. Pathological: If contractions are too frequent during the 29th week of pregnancy, and there are irregular lower abdominal pain, a sense of the fetus descending, and a small amount of vaginal bleeding or bloody secretions and other uncomfortable symptoms, then it is considered to be caused by preterm labor. The cause of preterm labor is not clear, but it is thought to be related to infection, increased synthesis of prostaglandins, and uterine overstretching. Once 29 weeks pregnant with preterm labor, you need to try to suppress contractions, control infection, reduce the chance of preterm labor, and if necessary, also need to promote fetal lung maturation treatment, which can improve the survival rate of preterm babies. Frequent contractions in the 29th week of pregnancy need to go to the hospital in time, under the guidance of the doctor for reasonable treatment.