Placental abruption is a serious condition in which your placenta separates from your uterus, partially or completely, before your baby's born.

There's wide variation in symptoms. A placental abruption can sometimes cause sudden and obvious bleeding, but in other cases there may not be any noticeable bleeding at first, or you might have only light bleeding or spotting. Or you might see bloody fluid if your water breaks.
You might have uterine tenderness, back pain, or frequent contractions, or the uterus might contract and stay hard — like a cramp or contraction that doesn't go away. You might also notice a decrease in your baby's activity. Immediate medical attention is a must.