Stress, Cortisol, and Stretch Marks: What Actually Causes Them

Stretch marks, known medically as striae distensae, are among the most common skin changes there are. They often appear during puberty growth spurts, pregnancy, rapid weight gain, or intense muscle building. In recent years, social media has added a new explanation to the list: stress. The claim is that high cortisol from a stressful life thins the skin and causes stretch marks, so lowering cortisol will prevent them. There is a real biological thread here, but it is much thinner than the marketing suggests.

Start with what is solid. Stretch marks form when the dermis, the supportive middle layer of skin, is stretched in a way that disrupts its collagen and elastic fibers. Early marks tend to look red or purple and later fade to pale, slightly sunken lines. Reviews of the research, including the StatPearls clinical overview from the U.S. National Library of Medicine, describe the exact cause as not fully understood. Genetics, hormonal changes, and mechanical stretching all appear to play a role, which is why some people get them easily and others rarely do.

The cortisol link is real at the extreme end. Glucocorticoids, the hormone family that includes cortisol, can slow the activity of fibroblasts, the cells that build collagen. People with Cushing's syndrome, a medical condition involving persistently very high cortisol, often develop wide, purple stretch marks, and doctors treat them as one of the more telling signs of the condition. Long-term use of oral steroid medicines, or strong topical steroids applied to the same area for extended periods, can also cause them. These situations involve hormone exposure far above what normal daily stress produces.

That is the leap the "stress gives you stretch marks" idea makes. There is no good evidence that ordinary life stress, which raises cortisol briefly and within normal limits, causes stretch marks in otherwise healthy people. Stress can affect habits such as eating and sleep, and weight changes can contribute to stretch marks, but that is an indirect path and not the same as cortisol damaging the skin. New, wide, purple marks that appear without an obvious cause, especially alongside weight gain around the middle, easy bruising, or muscle weakness, are a reason to see a doctor rather than to try a supplement.

What about prevention and treatment? A 2014 systematic review by Al-Himdani and colleagues in the British Journal of Dermatology found few high-quality trials and concluded that topical products did not appear effective at preventing stretch marks. A Cochrane review of creams and oils used in pregnancy, including cocoa butter and olive oil, likewise found no high-quality evidence that they prevent stretch marks. Some treatments, such as prescription tretinoin for early red marks and certain lasers or microneedling procedures done by professionals, have shown improvement in appearance in studies, but results vary and marks rarely disappear completely. The American Academy of Dermatology notes that treatment tends to work best on newer marks.

So what is proven and what is trend? Well established: very high cortisol, as in Cushing's syndrome, and prolonged steroid medicine use are linked to stretch marks, and growth, pregnancy, and weight changes are common triggers. Weak or unproven: the idea that everyday stress causes them, or that cortisol-lowering supplements or teas can prevent them. Marketing: creams promising to "erase" stretch marks. A dermatologist can help sort out options and check for an underlying cause if the marks look unusual.