Congestion in the lungs, or lower respiratory tract, can be acute or chronic and can be caused by a variety of factors. Upper respiratory infections that are not resolved can move down and become lodged in the lungs. Deeper respiratory infections like pneumonia, bronchitis and emphysema all create congestion in the lungs. Additionally, continual inhalation of irritants like smoke, mold, dust, allergens or environmental toxins can cause the lungs to become congested. Whatever the cause, lung congestion can lead to a cough that can be wet or dry, wheezing, and breathlessness. Herbs help to boost immune function and speed healing time, drain mucus and fluid from the lungs, disinfect the lungs from potential pathogens, and provide symptomatic relief.