Swallowing difficulties are common with ataxia people. First appears to be coming from lungs, asthma, chest infection etc.
Ivan recently had a fluoroscopic swallow, at X-Ray dept. Resulting now in soft food only and thickened fluids.
He coughed continually as his throat tried to get rid of bits of food which had got stuck. Gone down the wrong way. But with care this, we hope, will sort. Have a look at the internet