Hyperdense shadows in the right upper lobe of the lung may be lung cancer, but can also be seen in conditions such as tuberculosis and pneumonia. Under chest radiograph, normal human lung tissue is low density, and solid tissue or fluid exudation of malignant tumor is high density. The hyperdense image of lung cancer often shows nodular or lumpy shape, with irregular edges of the mass, “burr-like” or “lobular” appearance. Lung cancer is a common cause of hyperdense images in the right upper lobe of the lung. Right lung tuberculosis is commonly found in the posterior segment of the upper lobe tip and the dorsal segment of the lower lobe, and the tip of the lung is the most common site of tuberculosis, which is usually manifested as patchy high-density shadows or cloudy shadows in the tip of the lungs bilaterally or unilaterally, and is often accompanied by low-grade fever, night sweats (sweating abnormally after falling asleep, but sweating stops when waking up), and malaise, and other manifestations. Patients with right upper lobe pneumonia, especially lobar pneumonia, also have hyperdense shadows in the right upper lobe of the lung, but the hyperdense shadows caused by lobar pneumonia are more extensive and often involve the entire lobe of the lung. It is recommended to consult a doctor in time to clarify the nature of the lesion and treat the symptoms.