If the bloody nightmare lasts for more than 20 days, it is a sick state. If the bloody nightmare lasts too long, it is pathological, for example, it may be related to postpartum deficiency, lack of rest, or over-eating, such as eating too much chicken or drinking too much brown sugar water, or poor contraction of the uterus, or residual placenta. Some placenta residues need to be treated to promote contractions or even to clean the uterus in order to get rid of the dew. If the bloody dew lasts for a long time after normal delivery, it is a bad contraction, so you can take oral motherwort capsules or use uterine hormone to promote contraction treatment, or give Chinese medicine soup biochemistry soup plus reduction treatment. In short, after the normal birth of the nightmare is generally clean within 20 days is considered normal, if the bloody nightmare lasts too long is the nightmare does not end, is pathological, need to seek medical attention as soon as possible to identify the causes and then targeted treatment.