Causes of costochondritis include injury, arthritis, infection of the joints and tumors, according to Mayo Clinic. Wikipedia mentions that gastrointestinal and respiratory problems can also cause costochondritis. This form of inflammation is not identifiable in most cases.
Mayo Clinic notes that injuries that lead to costochondritis occur from an impact to the chest. Overexertion and lifting heavy objects creates chest complications, and strenuous activity may cause severe coughing that leads to chest pain. Wikipedia claims that heart attacks, aortic aneurysm or pericarditis myocarditis are cardiac complications that can lead to costochondritis.
Mayo Clinic mentions that costochondritis is caused by arthritic problems, such as rheumatoid arthritis, osteoarthritis and ankylosing spondylitis. Wikipedia adds that rib fractures lead to costochondritis.
Mayo Clinic further adds that fungal, bacterial and viral infections can spawn costochondritis. Syphilis, tuberculosis and aspergillosis are a few diseases that can create complications in the chest. Salmonella, Candida albicans, Actinomyces and Staphylococcus aureus are a few notable infections that can cause costochondritis. Wikipedia reports that Escherichia coli can also form costochondritis in rare instances.
Mayo Clinic claims that malignant and benign tumors can also cause costochondritis. Cancers that travel from the lungs, thyroid or breasts to the joints can also cause chest pain. Wikipedia notes that bone metastasis from certain cancers are root causes of costochondritis. Gastritis, esophagitis and gastroesophageal reflux disease fall under the umbrella of gastrointestinal ailments. Respiratory ailments in the form of pneumonia, pneumothorax and pulmonary embolisms can foster pain as well.