Rattle in chest when breathing

There could be some problem with your chest. It could be some infection. When you catch flu often these symptoms of difficulty in breathing and rattling sound is seen. Infection of the lungs produces more mucus. This blocks the nasal passage. You have to breathe harder as you push in the air to your lungs. This can cause rattling sound in chest. The same could happen when there is allergy. Allergy to dust or pollen could be the cause. Not just these any minute particle that can enter through the nose and irritate your lung can be the cause of the rattle.