Do you have tightness in your thoracic spine? It could be linked to your diaphragm! The diaphragm is the main muscle involved in breathing. Within the diaphragm there are three hiatuses (fancy word for space!) that allow three important structures to run through it at different levels, these correspond to points on the thoracic spine. The inferior vena cava runs through the diaphragm at the level of T8, the oesophagus at T10 and the aorta at T12. You can check if there is res