If you have experienced any change in your body which persist for more than a couple of days, these can be symptoms of cancer. Such symptoms include sudden weight loss, fever, ulcers in the mouth, change in color and pattern of the skin, bloody sputum, urine or stool, prolonged cough, change in testicles, pain in the abdomen, fever, prolonged cough, burning sensation in the n chest, etc. you should immediately consult a general physician in this case.