Fetus keeps moving all the time in 33 weeks of pregnancy may be due to physiological factors, or it may be caused by fetal hypoxia and other conditions, which need to be analyzed specifically. 1. Physiological factors: The activity of the fetus may increase when the pregnant woman is moving or when there are sounds in the external environment. Fetal activity is also more frequent in the afternoon and evening. 2. Fetal hypoxia: When the fetus is in intrauterine distress due to factors such as umbilical cord around the neck and placental abruption, the fetus suffers from hypoxia and will experience intense and frequent fetal movements, while there is often a decrease in fetal movements after intense fetal movements. The symptoms of frequent fetal movement in 33 weeks of pregnancy should be timely to the hospital, improve the relevant examination to clarify the cause of the disease, and symptomatic treatment under the guidance of the doctor.