Some of the symptoms are:
Gaping, gurgling, respiratory distress, head shaking, loss of appetite, and eventually, coughing and choking may occur.
Here is a website that explains gape worm. My prayers for your chicken!
https://poultrykeeper.com/respiratory-problems/gapeworm/
You shouldn't be worried! In most cases, this is just them being hot (they are "panting" like a dog would) or stressed. In rare cases, this could be a case of gape worm. If you are really worried, a visit to the vet couldn't hurt!