Every diaphragm on my table gets assess and worked on. They all get treated a little differently, but every diaphragm needs a little reorganization to prevent unnecessary tension on some very important structures:
the abdominal aorta - the artery the feeds EVERYTHING below your ribcage with blood. If it's pinned, your blood pressure goes up, just like a kinked garden hose.
the inferior vena cava - the vein that brings ALL of that blood back to the heart and lungs for gas exchange and detoxification. If it's squished, you get light headed and swell below the ribcage.
the esophagus - that brings food from your mouth to your stomach. If it's kinked, you can get a hiatal hernia, heartburn or have a hard time digesting food, especially protein.
the thoracic duct of your lymphatic system - helps return all the extra fluid in your body back to your heart. If it's blocked, the fluid stays stagnant like a pond and can breed bacteria, not to mention it's affects on the cardiovascular system.
the vagus nerve - your primary parasympathetic (rest and digest) nerve that's responsible for relaxation, stress reduction, digestion, sleep, pleasure, etc. If it's tethered, ain't nothin' working like it supposed to. It's like the the chill out power's out.
If any of these structures are compressed by diaphragm tension, you've got issues with your cardiovascular system, immune system, nervous system, digestive system and the result is muscle tension in your low back, neck and shoulders, just to name a few things.
This is just the tip of the iceberg when it comes to diaphragm dynamics... essential organs sit directly on top and right below this muscley trampoline as well, but I'll save that for another day.