List of diseases that include tachycardia as a symptom. Any major, well-known medical conditions associated with tachycardia are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with tachycardia as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. Illnesses include everything from Heart Disease to Diabetes insipidus.This list answers the questions, "What risks are associated with tachycardia?" and "What disease can I have if I have tachycardia?"