T-wave hyperacuity is an abnormally high spike in the T-wave on the ECG. This condition may be the super-acute stage of myocardial infarction, which is very dangerous and requires immediate emergency treatment in the hospital. It may also be seen in patients with hyperkalemia, which is also dangerous when the blood potassium is abnormally high, and needs to go to the hospital for symptomatic treatment in time. In addition, the T-wave is high and sharp in thin normal people, which is not dangerous and does not need to be treated. In the super-acute stage of myocardial infarction, when myocardial damage occurs and the T wave of ECG is abnormally high, the patient will feel pain in the anterior region of the heart, suffocating, sweating and even have a sense of dying, and the patient needs to have coronary stenting surgery immediately, or else his life will be in danger. When the patient has electrolyte disorders, the blood potassium increases, the T wave will also be abnormally high and sharp, just like a tent, at this time, electrolyte disorders should be corrected immediately, otherwise, metabolic acidosis, respiratory difficulties, serious cardiac arrest can occur, which is life-threatening. Some thin normal people may also have high T-wave, which may be a normal variant of early repolarization and usually requires no treatment. There are many causes of T-wave hyperintensities, which need to be diagnosed by a doctor and treated according to the specific situation.