Rheumatic fever is a disease that usually occurs in children after an untreated streptococcus throat infection. Congenital heart disease is when babies are born with defects in their heart. High blood pressure, also called hypertension, occurs when too much force is exerted on arteries and can lead to headaches, dizziness, and heart issues if uncontrolled. Coronary artery disease occurs when cholesterol builds up in arteries and can block blood flow to the heart.