There are many signs and symptoms for Long Q-T Syndrome (LQTS,) but sometimes symptoms can not easily be seen or felt. In fact, almost half of all sufferers will never show any signs or symptoms. In about five percent of people with inherited LQTS, the first symptom is sudden death. For people that do present symptoms, the most common ones are:

· Fainting

· Seizures

· Sudden death

· Deafness(occurs only in one type of LQTS)