Retrosternal pain and discomfort refer to sensations felt behind the breastbone (sternum) in the chest area. This type of pain can vary in intensity and duration, ranging from mild discomfort to severe, sharp pain. It may be described as a tightness, pressure, or burning sensation in the chest. Retrosternal pain and discomfort can be caused by a variety of medical conditions, such as heart disease, gastrointestinal issues, respiratory problems, or musculoskeletal disorders.