Given the information you provided (pain in upper right lung area, difficulty breathing), it seems likely that you might have experienced pneumothorax. Pneumothorax is a condition in which part of, or the whole lung collapses. The collapse is actually deflating of part of the lung or the whole lung.
The causes might include: injury, certain medical conditions (chronic obstructive pulmonary disease (COPD), asthma, cystic fibrosis, and pneumonia). In certain cases, the cause cannot be identified and it is called spontaneous pneumothorax.
In all cases, the mechanism of pneumothorax is the same. Air enters the pleural cavity, either from outside or from the lungs. The pleural cavity is the empty space between the two layers of the pleura (double-layer membrane that surrounds the lungs).
Pneumothorax is easily detected with an X-ray.
You might want to visit a specialist for pulmonary disorders or an internist for a physical examination and an X-ray. Additional tests might be needed to detect the possible causes for the pneumothorax.
In many cases, the pneumothorax can resolve on its own, but if the cause still persists it might occur again. In certain cases, the pneumothorax has to be treated by special procedures that would take the air out of the pleural cavity.
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