Stretch marks are very often regarded solely as a cosmetic flaw, but in reality they may also indicate hormonal imbalances. Cortisol is of particular significance; elevated levels of this hormone weaken the skin’s structure by inhibiting collagen synthesis. In practice, this means that the skin becomes thinner, less elastic and more prone to damage, even with minor changes in body weight. Equally important are fluctuations in oestrogen levels, which are responsible for maintaining proper hydration and elasticity of the tissues. In some patients, stretch marks may be one of the first visible signs of endocrine disorders, particularly when they appear suddenly and in unusual locations. In such cases, it is worth paying attention to other symptoms, such as fatigue, fluctuations in body weight or a deterioration in skin condition.