Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Achalasia requires long-term follow-up because treatment controls the obstruction but does not cure the underlying nerve disorder.
Routine visits may review swallowing, regurgitation, chest discomfort, weight, nutrition, and possible reflux.
Depending on the procedure and symptoms, follow-up may include endoscopy or acid testing.
Reflux treatment can include lifestyle measures or acid-suppressing medication under clinical guidance.
The article also says
Symptoms alone do not always show how well the esophagus is emptying.
If swallowing problems continue or return, a clinician may recommend a timed barium esophagram, endoscopy, manometry, or FLIP.
Testing can help distinguish recurrent sphincter tightness from reflux-related inflammation, scarring, spasm, or advanced enlargement of the esophagus.
After POEM, Heller myotomy, or dilation, reflux may occur even without obvious heartburn.
Contact the treating team routinely if symptoms gradually return, meals are taking longer, nighttime regurgitation develops, or weight is falling.
Earlier assessment may allow additional treatment before nutrition or lung health is affected.
Every sign above is quoted from the sofidex article on Achalasia. If you are not sure, err upward — it is always reasonable to be checked.