There are many reasons that you may be experiencing pain in the diaphragm but the main three causes for severe pain are congenitial diaphragm hernias, traumatic rupture and due to neurological dysfunction. Congenital diaphragm hernias are caused during birth and often lead to respiratory disorders, such as difficulty in breathing. Many individuals can go for years without experiencing and problems with these hernias until the case becomes severe and serious.
If you are also experiencing pain in the abdomen then you could be suffering with a traumatic rupture. This can be due to injuries caused in the thoracic and abdominal cavities because of major accidents or because of any piercing of the muscles with sharp objects. When the lungs are also affected, this can be the cause for diaphragm pain. Some heart failures or diseases may cause pain in the diaphragm along with those in the chest and left shoulder. These ruptures will decrease the sound of the breath and sometimes the sound of the bowels can be heard in the chest. Sever diaphragm pain may also be caused by nerve disorders. When the nerves from the spine are inflamed or injured, this can cause neuron dysfunction and in turn lead to pain in the neck, chest or diaphragm.