Multiple nodular hyperdense shadows in the left lung are usually caused by pulmonary sclerosing hemangioma, inflammatory pseudotumor, and benign lung tumor. 1. Pulmonary sclerosing hemangioma: Pulmonary sclerosing hemangioma is a kind of rare benign tumor of the lungs, which is usually caused by the obstruction of the development of lung tissues, inflammation and other reasons, and the patient may have symptoms such as coughing and coughing up blood. 2. Inflammatory pseudotumor: Inflammatory pseudotumor is generally a chronic non-specific proliferative inflammatory disease, usually caused by the patient’s personal factors, immune system decline and other reasons, the patient may have cough, cough sputum, low fever and other symptoms. 3. Benign lung tumors: benign lung tumors generally refer to benign tumors growing in the bronchial tubes and lung parenchyma, usually caused by the patient’s daily habits, lung infections, etc., patients may have symptoms such as coughing, hoarseness, coughing up blood. There are other causes of multiple nodular high-density shadows in the left lung, such as lung cancer, etc. You should go to the hospital in time, and standardize the diagnosis and treatment under the doctor’s guidance, so as not to delay the condition.