PREcision MEDicine In Achalasia (PREMEDIA)

The goal of this clinical trial is to learn if shorter Per-Oral Endoscopic Myotomy (POEM) works as well as a longer POEM in patients with trouble swallowing due to certain conditions. The main question\[s\] it aims to answer \[is/are\]: * Does making a smaller cut in the muscle at the bottom of the esophagus work just as well as making the standard bigger cut in relieving symptoms? * Does making the smaller cut reduce the side effects of the procedure compared to the standard bigger cut? Researchers will compare the symptoms and side effects of making a shorter cut to the symptoms and side effects of a longer cut. Participants will allow researchers to access their standard of care information in their medical record, complete questionnaires at up to 6 times over a 2-year period.