Patient's question:
NoDoctor's answer:
The endometrial hypothesis is widely accepted by scholars and was first proposed in the 1920s. It is the earliest hypothesis to be proposed and widely accepted. During the menstrual period, blood from women can flow back through the fallopian tubes into the abdominal cavity, causing endometrial tissue to spread within the abdomen. Fragments of endometrium in the retrograde blood adhere to and infiltrate the peritoneal mesothelium, obtaining blood supply and continuing to survive and grow.