High bounce rates on mobile are often caused by poor user experience, such as unoptimized mobile design, slow load times, or intrusive elements. Mobile users expect fast, clean, and responsive sites, so ensure your layout adapts well to smaller screens. Large images or complex graphics can slow down mobile load times, which leads to higher bounce rates. Use tools like Google’s Mobile-Friendly Test to assess your site’s mobile performance, and compress images or remove unnecessary elements. Avoid pop-ups or interstitials that may be hard to close on a phone, as these can frustrate visitors. Improving mobile load speed and simplifying your design can enhance user experience, reducing bounce rates and encouraging longer visits.