A few months ago, I began experiencing a burning sensation in the left side of my chest. I couldn't tell if it was in my breast or chest, but I attributed it to chest pain since I have POTS (postural orthostatic tachycardia syndrome). I also experienced pain and tingling that went down my left arm, but was never consistent. For the last two months though I have been experiencing pain that clearly seems to come from my breast on the left side almost under my arm. I also have times when my breast is extremely itchy. I've been trying to ignore it, but it doesn't seem to be going away, and the pain does not seem connected to my POTS symptoms. Could these be a sign of cancer?