Drink more fluids. Water helps loosen mucus and soothe an irritated throat. Dry, hacking coughs respond to honey in hot water, tea, or lemon juice. Do not give honey to children younger than 1 year of age. Elevate your head with extra pillows at night to ease a dry cough. Try a cough drop to soothe an irritated throat.
That is actually true to a certain extent. Most of the time you need to have some sort of sensitivity/allergy to dairy. But dairy products can increase the thickness of your phlegm, therefore can clog up your sinuses, and eventually cause the sinus pressure.
The Food Connection. Foods have a direct impact on the sinuses and mucus. Dairy foods increase mucus production while fresh fruits and vegetables aid in the elimination. Drinking teas can also aid in the elimination of excess mucus. The temperature of consumed foods can also make a big difference.