There are several ways to release this, but I strongly suggest using a Salonpas patch. Put it right there where the green X marks the spot. It works very consistently. If you don't have the patch, doing the doorway stretches in this post is cheaper and quicker. However, if you don't use the Ice-and-Stretch method, you might aggravate it. Notably, ice-and-stretch can be intense when you ice this area, but that means it's much more likely to offer great relief from coughing.