✱ 1 – Coughing Thick Rust-Colored Mucous
If you are coughing up mucus and it is constantly thick and has a rust color, then that can be a sign of cancer. Especially if you have no other signs that point to pneumonia. The rust color is from blood and if it is ongoing, you need to have it checked out.
If you have any of these symptoms in addition to the persistent cough, you must see your doctor right away.
