14 Cancer Symptoms You Are Most Likely To Ignore

11. Excessive Cough

We’ve all had those coughs that seem like all our internal organs are going to fall out. But, if the cough isn’t related to a flu or if it lasts for longer than 3 weeks, it might be an indication of lung cancer. “If it’s different than your regular cough and if it persists or you cough up a little blood, that’s significant,” says Dr. Markman, MD, an oncologist at Cancer Treatment Centers of America. Excessive coughing is also common signs of laryngeal and thyroid cancer.