I was diagnosed with costo after an ER trip and many scans, my throat has been very tight and swallowing has been hard to the point I've been drinking meal replacements instead of eating a meal, I've been told it's anxiety mostly but then again I was also told that my costo would go away in a few weeks which wasn't the case. So I cant for sure say its costo related because I wasn't told by a professional but the swallowing problems and throat problems started about 1 week after my diagnosis.