- Also: striae gravidarum
Pregnancy stretch marks, also known as striae gravidarum, are a common and natural part of the physical changes many bodies experience during pregnancy. As a birth doula, I often hear from clients who are curious about these marks, and I want to offer a grounded, evidence-based perspective on what they are and how to approach them with clarity.
What it is
Striae gravidarum are a type of scar that forms when your skin stretches rapidly. They typically appear as red or purple lines on the skin, most commonly on the abdomen, breasts, thighs, and buttocks. This rapid stretching often occurs during the second and third trimesters as your body grows to accommodate your baby. It’s a very common experience, affecting a significant number of pregnant individuals.
There's a strong genetic component to whether you develop stretch marks. This means if your mother or other close relatives experienced them, you might be more likely to as well. It's simply how your unique skin responds to the incredible growth happening within your body. Just as your body might experience Round Ligament Pain or Heartburn During Pregnancy as it adapts, stretch marks are another form of physical adjustment.

