It will be. The insensitivity of the lung and visceral pleura to pain may be related to the fact that the nerve endings distributed to these organs contain few fibres, so early stage lung cancers that do not involve the pleura are mostly asymptomatic or have atypical symptoms. In contrast, metastatic lung cancer involving the bronchi and pleura will cause pain by stimulating the nerve sensory fibres in the mural pleura and trachea.