What causes a vertical line in the middle of the abdomen?
Generally, the term "belly" refers to the abdomen. A vertical line appearing in the middle of the abdomen may be caused by pregnancy, gender differences, stretch marks, diastasis recti, or linear sebaceous gland hyperplasia. If discomfort occurs, timely medical consultation is recommended. Detailed explanations are as follows:
1. Pregnancy
During pregnancy, increased progesterone levels cause ligaments and muscle tissues to relax in order to accommodate the enlarging uterus. The rectus abdominis muscles are gradually pushed outward by the growing uterus, causing the linea alba to become more prominent, forming what is known as the pregnancy midline line. This condition generally requires no special treatment and usually fades naturally after childbirth.
2. Gender Differences
Individual variations and skin pigmentation can make the linea alba more noticeable. This is related to hormonal levels, genetic factors, and skin type. If this vertical line does not affect health, treatment is usually unnecessary. However, if it causes aesthetic concerns, camouflage cosmetics or treatments such as laser therapy and microneedling may be considered to help reduce pigmentation.
3. Stretch Marks
In individuals who are obese or experience rapid weight gain within a short period, excessive skin stretching can damage the elastic fibers of the muscles, leading to the formation of stretch marks on the abdomen that may appear as a vertical line. In such cases, it is recommended to control weight through a healthy diet and appropriate exercise to reduce skin tension and minimize the formation of stretch marks.
4. Diastasis Recti
Diastasis recti is commonly seen in postpartum women, obese individuals, or those who engage in activities that place prolonged pressure on the abdomen. When the rectus abdominis muscles separate, the linea alba in the center of the abdominal wall becomes loose, forming a noticeable vertical line. Diastasis recti can be improved through physical therapy and targeted abdominal muscle exercises.
5. Linear Sebaceous Gland Hyperplasia
Linear sebaceous gland hyperplasia is associated with ultraviolet exposure and chemical irritation. This condition causes the midline of the abdomen to display a line of follicular-like arranged openings, accompanied by slight elevation, and may present symptoms such as redness and pain. Treatment should follow medical advice and may include topical application of medications such as tacrolimus ointment, viaminoid capsules, or tretinoin cream.
It is recommended to regularly clean the abdominal skin to remove excess oil and dirt, which helps maintain healthy skin condition.