Eight signals of cancer:

1, rapidly growth painless mass;

2, unexplained weight loss and anorexia;

3, abdominal pain without incentive factors;

4, unknown reasons of black stool or bloody stool;

5, size, shape or color changes of the moles;

6,intestinal obstruction in old people;

7, unexplained irritating cough and hemoptysis;

8, burst of irregular upper abdominal pain.