am 49 years old, more than two years ago I had a uterine polyp removed, then after a while I stopped menstruating, for about a year now. In the past month, I have had symptoms of heaviness in my lower abdomen and back pain, and a few times I had a very small amount of pink blood. After an ultrasound, the doctor concluded: The uterine cavity has a thick echo structure of 10×15 mm, and does not receive Doppler signals. Doctor, is a uterine cavity with a thick echo structure of 10×15 mm dangerous?