Back pain after seeing red is usually a sign of labor. Seeing red and having irregular lower abdominal pain are signs of labor with premonitory signs. Most pregnant women will have redness and lower back pain 2-3 days before regular contractions, which may be caused by irregular contractions, and may soon enter the labor process, at which time they should be prepared for labor. If the backache progresses to regular contractions, it is time to enter the labor process. Regular contractions are contractions that last about 30 seconds, with a 5-6 minute interval of rhythmic abdominal pain, and as labor progresses, the duration of the contractions is gradually lengthened and the intervals are gradually shortened. If you have redness and back pain, you should go to the hospital as soon as possible for ultrasound and fetal heart rate monitoring, and do internal examination to check whether the cervix is receding.