A 45 years old car repairman, accompanied by his wife, stated that he suffered intermittent cough for 3 months, without phlegm. In the past 20 days, his cough intensified, phlegm with blood, no fever, chills and other symptoms. Physical examination: T36.7 °C , P78 beats/min, R19 times/min, BP110/70mmHg, superficial lymph nodes were not palpable. Highly suspected of lung cancer. .Important information that cannot be omitted when collecting information on his medical history is ( )