<s>[INST] i am 27 female and i dont have any problems in the past but latly my heart beats fastest than usual ana i can feel it in my throat and in the same time i fell like something is blocking the air down my throat and i cant breath all the way in ...all this comes together ..what should i do [/INST] Hi, This is Chat Doctor. Increased heart rate & palpitations can have a lot of causes. It can be normal sinus tachycardia due to anxiety or stress, or it could be abnormal supra ventricular tachycardia. For the diagnosis, you need to do ECG at the time of palpitation & tachycardia. If the duration of palpitations are short enough to reach a nearby hospital, we put a 24hr ECG monitoring (Holder Monitor). You also need to do a 2D Echo & thyroid function test to see for any associated abnormality if any. Thanks </s>