Hi iam 27 f .Always my heart beat will b above 100 to 130 per minute even when iam resting. Spo2-97-99 Esr-28 Vit d3-15(took vit d3 course for 3 months with weekly once tab) Vit b12,thyroid serum creatinine serum uric acid thyroid lipidlft serum aec crp cbp ,nt pro bnp all are normal. Symptoms-upper back pain just back of breast(severe when I sit or do work )pain is less when I rest on bed. Heavy headedness Shortness of breath Left breast pain some days again some days it's normal and left shoulder blade pain Iam worried if at all it's related to heart .I already did nt pro bnp it's normal .So this heart beat ranging between 110-130 always in this age even in resting position is normal or anything to be worried off?doctors never cared about that heart beat . Doctor asked me to get mri spine for my pains Many medications used but no relief