What causes right side body pain from shoulder to leg?

When you feel pain on one side from your shoulder all the way down to your leg, there are a few things that might be causing it. One reason is scoliosis, where your spine curves in a twist, which can press on nerves and cause pain along one side. Another possible cause is sciatica. This happens when a nerve in your lower back is squeezed, causing pain to shoot down your leg. Sometimes, the muscles and joints on one side can become sore or inflamed. For example, costochondritis causes pain where your rib bones meet the cartilage near your chest, and this pain can sometimes stretch out to the shoulder and lower body. In some cases, internal issues such as a peptic ulcer (a sore in your stomach lining) may cause pain that you feel on your right side, though this is less common. Because many different things can cause pain along one side of your body, it's important to get personalized insights—you can start by taking a free AI symptom checker assessment to better understand what might be happening and help guide your next steps toward feeling better.