What to do if chicken is making wheezing noise?

[Nugget and Albert]

 

[Wyorp Rock]

Can you please give more information and some photos (chicken, housing, poop)?

How old?
How long have you had him/her?
Are there other symptoms - runny nose, mucous, watery bubbly or pus in the eyes, crop not emptying, etc.?
Is the chicken eating/drinking/active or lethargic?
What does the inside of the beak look like?
What do you feed?
Do you notice wheezing all the time or just during certain times like after eating/drinking?
Have any of your other chickens presented with coughing/wheezing or symptoms of respiratory illness?