Hi @closer0043 . Nope, not necessarily. Ekgs show cardiac rhythms. There are ranges for each person's 'normal.' I have had a longer q-t voltage than textbook normal my whole life. Stress tests, cardiac ultrasounds due to my familys' morbid, long history of sudden death cardiac disease lateron, and on repeat, and the cardiologists could see that that was simply how my heart beat, beat. Fingertip clubbing is usually a sign of vascular somethings or others, nerve issues, pituitary, thyroid, and or other glandular problems. Vascular problems, meaning what blood and lymph is pumped out to and through the body, has a more difficult time getting recirculated back, and picked up by veins going back to the heart, from the lymphatic system, so it can go back through the heart and pulmonary circuit again. I have venous damage from sports injuries, 3 pregnancies in a row, becoming overweight, bilateral total knee joint replacements to some extent, and so on. Living life basically. We dont go through life without some things simply happening no matter what we do or how proactive we are. The remedy to assist in my case, the lymph fluid that gets stuck in my legs occasionally, is a low dose diuretic, and drinking tons of water. Nerve damage can cause clubbing too, it depends on where said damage is. Ekgs cannot see or show coronary artery blockage, or as you stated, thyroid issues, which by the way, could also cause clubbing, and/or too much antidiuretic hormone, or the opposite not enough antidiuretic hormone, because though the regulator for that is the pituitary, the thyroid is like second in command pretty much and even benign nodules can cause one or the other glands to over produce or underregulate the messages to the kidneys to keep more water (urine) in the body, or, the opposite. If I were you, I would bring all of these up with the physician who did the thyroid biopsy. Maybe copy and paste all of this thread onto paper, or at least get it onto an iPad or something bigger than a phone screen, with your daily logs, (which I thought was/are just fantastic data for the correct Physician, and such smart thinking on your part, that I may steal that awesomeness of an idea for my own issues lol!,) schedule extra time with him or her, and share it all with them. No lie. Now that you mentioned thyroid, I am thinking that may be the root of most of it. And way to go with that self awareness, persistence, and consistency. Truly. Your self discipline from sports and activeness shone through. I have no worry about you. You will get to the bottom of it, and through anything. I believe that. -mary