Cancer signs should not be ignored, if any of these 10 symptoms persist for weeks, it is advisable to consult a doctor promptly. ★Unexplained weight loss, ★fatigue, ★lumps or thickening, ★skin changes, ★persistent cough, ★unusual bleeding, ★changes in bowel habits, ★difficulty swallowing, ★persistent indigestion, and ★unexplained pain.