Hello Heart rate more than normal needs to be looked for underlying causes, it is the tachycardia and the best test to find out the underlying cause of it is EKG, it could be conduction system defect, if the EKG is normal one then it is sinus tachycardia means it is the normal one and cause of it is not the heart disease but it could be functional in origin or nonspecific it may have several other reasons and all that needs differentiation. Hope I have answered your query. Let me know if I can assist you further.