Try Stretching the Jaw. Some people are more sensitive to pressure changes in the air. Swelling inside the ear canal can cause a loss of hearing that may result in sounds breaking up in a crackling noise.
Deep Coughing: Start by taking a deep breath. Hold the breath for 2-3 seconds. Use your stomach muscles to forcefully expel the air. Avoid a hacking cough or merely clearing the throat. A deep cough is less tiring and more effective in clearing mucus out of the lungs.
As is the case with mucus, phlegm that has a color such as green or yellow may indicate infection. Any time you see blood in the phlegm you cough up, you should seek medical attention. Mucus, explains Ellis, helps protect the lungs by capturing dirt and dust as you inhale.