Your first line of defense is to visit your primary care physician (PCP). If your PCP suspects that you have cancer, or if signs of cancer are revealed in tests or imaging, they will refer you to an oncologist for diagnosis and treatment.The signs and symptoms of cancer vary from person to person and depend on the type of cancer you may have, so it’s best to keep an eye out for some common symptoms, including:A cough or hoarse throat that doesn’t improve or go awayA high fever that lasts more than 3 daysFatigue that doesn’t get better with restPain that lasts for days and doesn’t go away or improve with treatmentThe presence of blood in your stool or urineUnexplained weight lossUnusual changes in your skin’s appearance, either in color or textureBecause the symptoms of cancer are so varied, check out these additional resources:Symptoms of cancer in womenSymptoms of cancer in men