Why Does the Stomach Hurt during Implantation?

Update Date: 2024-06-26 Source: Network

Implantation abdominal pain refers to the abdominal pain symptoms that occur during the implantation of the fertilized egg. This is due to the secretion of proteolytic enzymes by the fertilized egg after it enters the uterus, which dissolves the surface in contact with the uterus, resulting in damage and bleeding of the endometrium. This is usually a normal phenomenon.

Implantation refers to the process of the blastocyst invading the endometrium through interaction with it. It is generally believed that implantation begins on the 6th to 7th day after fertilization and is completed on the 11th to 12th day. The most common implantation site is the upper part of the posterior wall of the uterus near the midline, lasting for about three to four days. During this period, there may be mild bleeding and abdominal pain. Some women usually have no special symptoms after the implantation of the fertilized egg, but some may feel nausea, softer breasts, fatigue, frequent urination, bleeding, or cramps.

The abdominal pain symptoms during the implantation of the fertilized egg are caused by the secretion of proteolytic enzymes by the fertilized egg after it enters the uterus, which dissolves the surface in contact with the uterus, resulting in damage and bleeding of the endometrium. This process may cause mild abdominal pain or needle-like pain. Generally, no special treatment is required, and there is no major problem.

The necessary conditions for the implantation of the fertilized egg include the disappearance of the zona pellucida, the differentiation of blastocyst trophoblastic cells into syncytiotrophoblast, the synchronous development and functional coordination of the blastocyst and endometrium, and the secretion of sufficient estrogen and progesterone in the body. Successful implantation requires the endometrium supported by estrogens and progesterone secreted by the corpus luteum to be receptive. However, the receptiveness of the endometrium is only present between the 20th and 24th day of the menstrual cycle, also known as the window period. The uterus only allows the implantation of the fertilized egg during this brief window period. However, if severe abdominal pain occurs, it may be caused by ectopic pregnancy or other digestive system diseases. It is recommended to seek medical attention promptly for diagnosis and treatment.