<s>[INST] Hi im saral from India.some time s I feel difficulty in breathing and my heart beat become fast.this was started when I was loosing weight.but two years back I got some allergy on my fingers.then next year I got allergy in my nose itching and all and this year aim having breathing problem.I become nervous so fast and my heart start racing like hell.so please guide me. [/INST] Hello and thank you for using Chat Doctor. I carefully read you question, and I understand your concern. I will try to explain you something. There are different reasons that might cause increased heart beats. Simple physical or emotional stress, caffeine products might cause increased heart frequency so It's mandatory to avoid them. All sow, there are different pathologies like anemia, thyroid gland problems like hyperthyroidism that might be the cause of fast heart beats.  An active allergy, as you explain might be another cause. When you experience a high frequency, it might be normal to experience palpitation, chest discomfort or difficulties in breathing deeply. This breathing problems might be related to high heart frequency or may be related to allergy that irritate the respiratory system. If these high frequencies are interfering in your normal daily live, If I was your treating doctor I will recommend some simple examinations. I will recommend an electrocardiogram, a cardiac echocardiography and of course a rhythm holder monitoring for 24 h. This is necessary to have a full view of your mean frequencies during day and night. After these, a full blood check up to exclude anemia or thyroid problems and of course consultation with an allergo-logyst to help you pass the allergy problems. Doing these examinations helps us understand if it is necessary to treat this high frequencies or not. Sometimes, finding the allergy trigger and treating it resolves everything. Hope I was helpful. Wish you good health. Best regards. </s>