| Cause of pain | Workup | 
|---|
| Rib (stress) fracture Fractures of the Ribs and Pelvis | History, rib compression test | 
| Slipping rib syndrome | History, symptoms in the lower thorax | 
| Myofascial symptoms and muscle injuries Muscle Injuries (pectoral muscle, oblique abdominal muscles, anterior serratus muscle, superior posterior serratus muscle, rhomboid muscle, subclavius muscle, etc.) | History and palpation | 
| Osteoarthritis of the sternoclavicular joint | History and imaging | 
| Seronegative arthritis, ankylosing spondylitis or other spondyloarthropathy Axial Spondyloarthritis and Ankylosing Spondylitis with possible inflammation of the sternoclavicular joint | History; usually more extensive symptoms | 
| Fibromyalgia Fibromyalgia | Workup of fibromyalgia by questionnaire, for example | 
| Intervertebral disc prolapse in the thoracic spine | More extensive pain within a dermatome, usually provoked by rotation of the thoracic spine | 
| Shingles Shingles (Herpes Zoster) | More extensive pain within a dermatome, skin blisters appearing in a few days | 
| Pneumonia Pneumonia | Fever, general condition, findings on auscultation, laboratory tests and chest X-ray | 
| Symptoms of cardiac origin, such as coronary artery disease Chronic Coronary Syndrome (Coronary Heart Disease) | Patient history, auscultation, laboratory tests and ECG | 
| Malignancy, such as lymphoma Lymphomas | General condition, laboratory tests and imaging |