What Causes a Vertical Line in the Middle of the Stomach?

The vertical line in the middle of the abdomen is a normal physiological phenomenon, generally known as the abdominal midline or the navel line, which is a normal tissue line of the human body. Due to individual differences in body constitution, some people may have a more prominent abdominal midline. For pregnant women, affected by progesterone, the abdominal midline will become increasingly prominent after 2-4 months of pregnancy, and gradually fade for many people after childbirth.

Situation 1

The line in the middle of the abdomen is the abdominal line, which is present in everyone, regardless of gender. However, some people may have a less prominent abdominal line, while others may have a more prominent one. Therefore, there is no need to worry too much as it is a normal physiological manifestation.

Situation 2

Medically, this line is known as the abdominal midline, which is already present at a very young age, but not very prominent due to age. However, as people age, it becomes more and more prominent. This line is mainly formed by the intertwining of the left and right abdominal muscles and serves as the centerline of the human body. Although it is not particularly prominent on the abdomen, it is very prominent below the navel and becomes deeper with age.

Situation 3

After a woman becomes pregnant, the color of the abdominal midline begins to darken, gradually forming the pregnancy lines commonly referred to. Generally, this pregnancy line starts to fade slowly around one year after childbirth, gradually returning to its original color.