A solid nodule of 5.9mm in the lower lobe of the right lung is not normal. Lung structures generally include trachea, bronchioles, capillary bronchioles, alveoli, etc. The presence of a solid nodule is definitely not normal. A solid nodule in the lower lobe of the right lung usually refers to a lesion in the lower lobe of the right lung with a diameter of less than 3 centimeters, which may be round or irregular in shape, and may or may not have clear margins. There are many causes of solid nodules in the lower lobe of the right lung, commonly including tuberculosis, pneumonia, lung malignant tumors, etc. Clinical diagnosis can be clarified by CT, PET CT, tumor markers, inflammatory indicators, biopsy and puncture. If the patient has a solid nodule 5.9mm in the right lower lung, he needs to go to the hospital in time and be treated under the doctor’s guidance, and patients with no special complaints of discomfort can be considered to follow up once every six months for a repeat chest CT.