Question: 13 signs you may have cancer?
Answer: Blood in the stool. Seeing blood in your stool can be scary. ... 
Chronic coughing. Is it the common cold, allergies, the flu, or something more? ... 
Chronic headaches. ... 
Difficulty swallowing. ... 
Difficulty urinating. ... 
Excessive bruising. ... 
Frequent fevers or infections. ... 
Noticeable skin changes.