What might cause chest pain on the left side above the breast?

When you feel pain on the left side of your chest, right above your breast, there are a few reasons that could be causing it. One common cause is costochondritis. This happens when the cartilage that connects your ribs to your breastbone gets swollen or irritated, making the area sore. Another possibility is a rare condition called Mondor's disease, where some of the veins just under the skin develop inflammation or clots, leading to sharp pain. In some cases, chest pain in this area could also be related to heart problems. Angina, for example, is when your heart does not get enough blood, and it can cause pain in parts of the chest, though this pain sometimes feels different from pain in the rib areas. There are also cases where heart rhythm issues, like a left bundle branch block, can mimic pain that feels like it is coming from the heart. Since many different factors can cause chest pain, it is important to get personalized insights—try our free AI symptom checker to better understand what might be causing your discomfort and help determine if you need to see a doctor.