Suspected nodule 4mm in the upper lobe of the right lung, if it is a solid nodule, inflammatory nodule are not serious; if the density is not uniform, it is suspected that malignant changes may occur, which is a serious situation.
Solid nodules less than 5mm in the lungs are categorized as low-risk nodules, and may also be inflammatory nodules, which can be treated with anti-infective therapy for 5-7 days, and then rechecked after one month, which is a non-serious situation.
If the density of the nodule is not uniform, the shape is irregular, the blood circulation is rich, or the nodule grows rapidly and has the possibility of malignant tumor, it is a more serious situation.
For suspected nodules in the upper lobe of the right lung, the specific nature and severity need to go to the hospital and let the doctor make a comprehensive judgment.