Hello doctor, I am having a burning or may be acidity from my stomach to my throat and sometimes in my chest, sometimes when I breath deep I feel someone is stretching my veins in my chest, and I feel some kind of lumps is there in my throat, specially when I gulp something I am having this for 4 days. I use to smoke a little, but was a heavy smoker for 3 years like 10 cigarettes on an average in past but now 1 or 2 on a daily basis, should I be worried of cancer or something, am nervous and can't sleep please help me out doctor. I am turning 28 now, height 5.6, weight 65kgs. Never diagnosed with anything and not a cancer family background. Thanks a lot in advance.