2. Rust Colored or Reddish Phlegm
Any time that you are coughing up blood there could be an underlying health issue. Coughing up phlegm that is reddish or rust colored could be a symptom of developing lung cancer. Should you find yourself with a persistent cough and you begin seeing red or a darker color in the phlegm that you are expelling, it is important to see your doctor.
While coughing up red colored blood does not necessarily mean that you have developed lung cancer, it is definitely a symptom that needs to be monitored.