 [ Symptoms ] pain behind right eye blurriness headache sinus pain [ Disease ] people often believe that but dairy products do not cause excessive phlegm but dairy products can stick to phlegm making it seem more copious unless you are allergic to milk or milk products there should be no change in the amount of mucous your body produces during a cold with that said if milkcheese seems to make things worse for you than the answer is simple do not eat em when you have a cold