Pulmonary embolism and lung cancer can be related; common causes of pulmonary embolism include amniotic fluid embolism, air embolism, and deep vein thrombosis.

In patients with lung cancer, when cancerous emboli enter the bloodstream, they can cause pulmonary embolism. Additionally, if the patient's condition is poor, with difficulties in eating, prolonged bed rest, and increased blood viscosity, deep vein thrombosis can occur, leading to pulmonary embolism.

Therefore, there is no absolute relationship between pulmonary embolism and lung cancer, but lung cancer may trigger pulmonary embolism.