What might cause a lump on the right side of the abdomen?

When you feel a lump on the right side of your belly, there are a few reasons you might have it. One possibility is that it could be a cyst. Cysts are like small, closed sacs that can fill with fluid and sometimes form in the abdomen. Another reason is a hernia, where a piece of tissue pushes through a weak spot in the muscles, forming a small bump. In some cases, the lump might be due to a growth or tumor. While many of these lumps can be benign (not cancer), some are more serious. Doctors often use imaging tests such as an ultrasound or CT scan to see inside your belly to find out the type of lump. They look at the size, shape, and other details of the lump to help decide what it might be. If you're experiencing these symptoms and want to better understand what might be causing them, you can check your symptoms with our free AI-powered tool to help guide your next steps. Because there are several possibilities—from simple cysts to tumors—it is very important to get a proper evaluation so that if treatment is needed, it can be started as soon as possible.