<s>[INST] I am experiencing tightness in my chest behind the breastbone, a VERY pronounced lump in throat, and some uncomforatble tightness in my up back directly behind the pain from my breastbone. I tried taking TUMS but it didn t help. This has happened before, what could it be? [/INST] Do you suffer from allergies/asthma or are you a smoker. Your symptoms suggest that you could be having asthma for which you need to consult your PCP as he will examine you and prescribe you medicines accordingly </s>