Red blood in the discharge at 34 weeks of pregnancy may be caused by pre-miscarriage, preterm labor, cervical lesions, low placenta position and so on. 1. Pre-eclampsia: due to strenuous exercise, overwork, etc. may lead to pre-eclampsia, manifested as red blood in the discharge, but may also be accompanied by abdominal pain, lumbosacral pain and other symptoms. 2. Preterm labor: 34 weeks of pregnancy belongs to the late stage of pregnancy, if there is a secretion with red blood accompanied by regular tightening and hardening of the stomach phenomenon, mostly indicates the presence of regular contractions, and this phenomenon exists in the possibility of preterm labor. 3. Cervical lesions: some pregnant women suffer from cervical polyps, cervical precancerous lesions, etc., which may also lead to the phenomenon of red blood in the secretion. 4. low position of the placenta: if the placenta position is relatively low, close to the cervical opening in the exercise is relatively large, sex is too intense and so on, may also be directly caused by the stimulation caused by bleeding. If you are pregnant for 34 weeks and have red blood in your secretions, it is recommended to go to the hospital in time, after the doctor’s interview, combined with the patient’s own condition and the results of other related programs, to clarify the cause of the disease and then to deal with it.