Sleeping on your stomach can cause back pain because it places your spine in an unnatural position for an extended period. When you sleep on your stomach, your spine may be twisted or arched, which can put stress on your muscles, joints, and nerves.
Additionally, sleeping on your stomach can force your neck to turn to one side for an extended period, leading to neck pain and stiffness. It can also put pressure on your internal organs and cause digestive issues.
Moreover, sleeping on a too-soft or too-firm mattress or using a pillow that is too high can exacerbate the problem. A soft mattress can cause your body to sink, causing your spine to bend unnaturally, while a too-firm mattress can push on your body, causing pressure points.
If you experience back pain after sleeping on your stomach, you may want to try sleeping on your back or side instead. You can also try placing a pillow under your hips to align your spine and reduce the pressure on your lower back. Furthermore, choosing a firmer mattress or a lower pillow can also help alleviate the pain.