Heart disease is a broad term that refers to many different conditions affecting the heart. These conditions rarely develop overnight. In most cases, heart disease slowly develops due to an unhealthy lifestyle or the presence of certain medical conditions. To avoid developing heart disease, adults should know what conditions put them at risk and how to protect themselves.Medical Conditions that Lead to Heart DiseaseThe conditions most commonly associated with heart disease are Diabetes, high blood pressure and high cholesterol. According to the American Diabetes Association, people with diabetes are much more likely to suffer a heart attack. In fact, two out of every three diabetics die from heart disease or stroke.High blood pressure can also lead to heart disease. This is mainly because high blood pressure causes the arteries to harden and thicken. As the arteries thicken, the blood vessels begin to narrow, which inhibits the flow of blood. High cholesterol also plays a part in thickening the arteries. High levels of LDL cholesterol will cause atherosclerosis. Atherosclerosis refers to the buildup of plaque on the artery walls.Other medical conditions that may lead to heart disease include anorexia, periodontal disease, connective tissue disorders, rheumatic fever, and certain infections, like infectious endocarditis. Patients who suffer from any of these conditions should discuss their risk of heart disease with their doctor.How to Maintain Heart HealthThe best way to maintain a healthy heart is to lead an active, healthy lifestyle. As people age, years of consuming a poor diet and leading a sedentary lifestyle will begin to catch up with them. Smoking, drugs and alcohol also increase a person's risk of heart disease. Over time, these factors take an enormous toll on a person's heart health.To maintain a healthy heart, you must commit yourself to being healthy. If you suffer from diabetes, high blood pressure or high cholesterol, begin working towards regaining control of your health. Seek the treatment necessary to control these conditions before they begin to affect your heart. In addition to taking medication for these conditions, include exercise into your daily routine. Cardiovascular exercise will not only burn calories and help you lose weight, but it will also strengthen your heart. When combined with a low-fat diet, a regular exercise routine will help you improve your health and reduce your risk of heart disease.