 [ Symptoms ] my mother is left lung had collapsed but doctors do not know why [ Disease ] hi if d dimer is chronically high it means clotting mechanism is defective and may affect the pulmonary venous circulation this may well be the cause of her lung collapse bronchectesis and consolidation are also known causes of lung collapse and is quite common at her age get her hrct chest and spirometry done a detailed blood profile may help to see any other associated pathologist consult a chest pulmonologist thanks