Coughing during eating can sometimes be a sign of oral dysphagia, but not always, of course. I was diagnosed with dysphagia a few months ago. Eating triggering coughing and being unable to properly break down foods I used to easily eat and swallow, such as raw veggies, are my main symptoms. I also have lots of throat mucus, but it's not only at mealtime. Best of luck to you.