56/m - clear chest X-ray 2 months ago but still got some blood in sputum while clearing throat. Slight loss in weight. Is this lung cancer (ex-smoker)?

Rexray. Just because X-ray was negative 2 months ago does not mean it still is negative or originally misread. because lesion was very small. If hemoptysis (blood in sputum)continues then further investigation including bronchoscopy should be performed. Other causes of hemoptysis include chronic bronchitis.