It is believedhas been observed that up to 80% of individuals experience striae in some area of their body/ In a recent study, 80% of the observed people experience striae in some area of their body. Striae on the upper arms may arise from physiological changes during puberty, rapid weight gain, or specific activities such as bodybuilding. If the striae are extensive and affect aesthetic appearance, you may consider employing various methods to reduce the visibility of striae on the upper arms in order to achieve a more desirable skin appearance.