Hi. Yesterday morning when I was showering, I felt like I had phlem in my throat, so I spit. When I did, it had a little bit of blood in it. That alarmed me, so I tried to produce more phlem to spit again. That too had just a bit of blood in it. Is this a sign I could have lung cancer? No other symptoms at all as far as cough, weight loss, or tiredness. Your help is appreciated. This only happened yesterday. Today I tried to do the same thing, and it was clear.