It depends. You might have pull a muscle, if the pain does not go away by 2 weeks. Then you should see a doctor
Diafragm, liver, stomac, spleen
Your liver and gallbladder and a portion of your small intestine, your lung
The lung. In the human body, the left lung is slightly smaller to make space for the heart. On the right - the whole space behind the rib-cage is take up by the lung.