Lung quercetin has no obvious therapeutic effect on lung nodules, and can play a role in inhibiting nodule oxidation and abating inflammatory reactions. Quercetin has antioxidant, anti-inflammatory, antitussive, expectorant, hypotensive, hypolipidemic, and immunity-enhancing effects, and is mainly used in the treatment of bronchitis and phlegmatic inflammation, and can be used as an adjunctive treatment for coronary artery disease and cardiovascular diseases such as hypertension. Quercetin contains natural ingredients such as loquat leaf and rosmarinus officinalis, which can play a role in protecting the health of the lungs, so quercetin for lung nodules does not play a role in subsiding the nodules, but it can reduce oxidative stress and inflammatory markers within the nodules. Common adverse effects of lung quercetin include acid reflux, increased inflammatory response in the body, etc. It should be used with caution in pregnant women and is contraindicated in allergic individuals. In summary, lung quercetin has no clear efficacy for lung nodules, if you suffer from lung nodules need to be under the guidance of the doctor symptomatic treatment, do not blindly use the drug, to avoid causing adverse consequences.