Jun 18, · Symptoms of both chest and breast pain can be: A feeling of pressure, fullness, or tightness in the chest Pain that moves to the back, neck, jaw, shoulders, and arms A pain that increases with deep breathing or coughing. Left Breast Pain Due to Left Sided Breast Cancer Most of the time—but certainly not always—breast cancer is painless in the early stages. There are exceptions to this rule, especially with cancers such as inflammatory breast cancer.
Cardiac Causes of Chest Pain. In this section, we’ll focus on causes of chest pain under the left breast associated with the heart. While discomfort due to heart disease often manifests as a dull pain under the left breast that feels like uncomfortable pressure, it can also be a burning or even stabbing pain depending on the condition.