Above the breast, there are ribs and clavicle from the bottom to the top, and there are abundant lymph nodes, arteries and veins above and below the clavicle, as well as brachial plexus nerves running from here. For example, in clinical cases of breast cancer, cancer cells can metastasize to the lymph nodes above and below the clavicle through lymphatic flow. The main contents of the thoracic cavity above the breast are the lung lobes, which are divided into left, right, upper and lower lobes through the mediastinum, and there are many important blood vessels and nerves passing through here. If you go higher up, you belong to the area related to the neck, which contains muscles as well as large blood vessels and nerves of the neck. In addition to ruling out trauma, the main reason for pain over the breast is to consider the presence of lung disease, such as pneumonia and pneumothorax, which often cause pain here.