Grinding glass-like nodules 4mm x 2mm are not serious in most cases, but the condition needs to be closely monitored. Mulled glass nodules 4mm x 2mm in diameter in the lungs may be localized inflammatory lesions, interstitial lesions, or even infections, which are generally not serious and sometimes exist for a long time and sometimes disappear on their own. If the diameter of ground glass nodules caused by infection is 4mm, antibiotics such as levofloxacin and other antibiotics are required. With effective anti-infection treatment, these nodules may also disappear and are usually not serious. In addition, in a few cases, a 4mm ground-glass nodule in the lung may also be a precancerous lesion, which progresses gradually and may progress to typical lung cancer. Therefore, close monitoring and regular review of chest CT is also necessary. If the diameter of the ground-glass nodule is found to increase slowly by CT, it is usually necessary to consider giving puncture biopsy or even surgical treatment. Patients should go to the hospital for timely examination and treatment under the guidance of the doctor.