Early-stage lung cancer does not cause chest pain. Early-stage lung cancer actually refers to precancerous lesions or the very earliest stage of the disease. Generally, early-stage lung cancer occurs within the lung parenchyma or the airway lumen. Typically, there are no sensory nerves in the airway lumens or lung parenchyma, and without sensory nerve distribution, there won't be any pain.

Of course, if the lung cancer grows to a certain extent and affects the pleura, it can cause chest pain because there are nerves, especially sensory nerves, distributed on the pleura. However, if it involves the pleura, it can no longer be called early-stage lung cancer, as it often indicates that the cancer has progressed to the middle or late stages.

Therefore, generally speaking, early-stage lung cancer in the lung parenchyma absolutely does not cause chest pain, so there is no need to worry.