Dear Sir/Mad I read carefully your problem and understood your concern. My answered is as follow: Did you have before cardiovascular problem? It’s the first time that your doctor find this chanches in EKG . Can you tell me please level of Thyroid hormone , on your blood test? Hypothyroidism commonly causes cholesterol abnormalities. You must too chek Lipid Profil. Chol ,TRG,HDL,LDVL.VLDL. About your qestatiotions if the EKG chanches is due to thyroid or heart problems? During Hypothyroidism can lead to various electrocardiographic changes including low voltage QRS complexes and T wave inversion. • It can also lead to bradyarrhythmias, mainly sinus bradycardia, which settles with thyroxine replacement • Ventricular tachycardia with prolonged QT interval attributable to the hypothyroid state occurred in one patient, with the QT interval normalising with thyroxine replacement therapy. Dear Sir/Mad • Be sure please if you have really Hypothyroid. • Check Blood test for Lipid Profil • Blood test for thyroid Hormonal level . • Repatetd EKG not under the stress or virus episode. • In my opinion your problem looks like heart desease. Thank you so much for using our services. Feel free to ask for more information and clarification if need be. Kind regards Klodiana Poshi