Da costas syndrome
Carbon monoxide poisoning
Sarcoidosis
Lead poisoning
Prolapsed intervertebral disc
Thoracic outlet syndrome
Adverse effect from certain medications

Diagnostic approach
History taking
Knowing a persons risk factors can be extremely useful in ruling in or ruling out serious causes of chest pain. For example, heart attack and thoracic aortic dissection are very rare in healthy individuals under 30 years of age, but significantly more common in individuals with significant risk factors, such as older age, smoking, hypertension, diabetes, history of coronary artery disease or stroke, positive family history (premature atherosclerosis, cholesterol disorders, heart attack at early age), and other risk factors. Chest pain that radiates to one or both shoulders or arms, chest pain that occurs with physical activity, chest pain associated with nausea or vomiting, chest pain accompanied by diaphoresis or sweating, or chest pain described as "pressure," has a higher likelihood of being related to acute coronary syndrome, or inadequate supply of blood to the heart muscle, but even without these symptoms chest pain may be a sign of acute coronary syndrome. Other clues in the history can help lower the suspicion for myocardial infarction. These include chest pain described as "sharp" or "stabbing", chest pain that is positional or pleuritic in nature, and chest pain that can be reproduced with palpation. However, both atypical and typical symptoms of acute coronary syndrome can occur, and in general a history cannot be enough to rule out the diagnosis of acute coronary syndrome. In some cases, chest pain may not even be a symptom of an acute cardiac event.
Bronchitis
Pulmonary embolism: Common signs and symptoms are shortness of breath, pleuritic chest pain, blood in sputum during cough, and lower limb swelling. Risk factors includes: recent surgery, malignancy, and bedridden state. Source of embolus usually comes from venous thromboembolism. Pneumonia
Hemothorax
Pneumothorax: Those who are at a higher risk of developing pneumothorax are tall, slim male smokers who have had underlying lung diseases such as emphysema. Those affected can have a sharp chest pain which radiates to the shoulder of the same side. Physical examination revealed absent breath sounds and hyperresonance on the affected side of the chest. Pleurisy
Tuberculosis
Tracheitis
Lung cancer

Gastrointestinal
Gastroesophageal reflux disease: The pain is aggravated when lying down or after meals. Persons may describe this as a heartburn. Besides, they may also complain of tasting bitter contents from the stomach. Achalasia, nutcracker esophagus, and other motility disorders of the esophagus
Diffuse esophageal spasm: Unlike cardiac chest pain, esophageal pain is not related to activity. The pain is usually associated with swallowing of hot or cold water. Esophageal rupture: Those affected usually complain of sudden, severe, and constant pain that starts from the neck to the upper abdomen. The pain is aggravated by swallowing. On examination, neck swelling and crepitations can be felt due to subcutaneous emphysema as free air is entering from esophagus into the subcutaneous tissue. Esophagitis: There are many causes of esophagitis. Esophagitis caused by Candida albicans is usually found in chemotherapy or HIV patients. Medication such as nonsteroidal anti-inflammatory drug and alendronate can induce esophagitis if not swallowed properly.