There are times when people panic because they automatically assume that there is a problem with their heart when in fact, there is nothing wrong at all. Most of the time, the pain that people feel under their left rib cage is because of the diaphragm or the stomach. The pain that people feel may be mild to moderate to severe.Can rib pain be a sign of cancer?
Bone pain: Pain is the most common sign of bone cancer, and may become more noticeable as the tumor grows. Bone pain can cause a dull or deep ache in a bone or bone region (e.g., back, pelvis, legs, ribs, arms). Early on, the pain may only occur at night, or when you are active. As the cancer develops, though, the pain may become more persistent.