Further, when this procedure continues for a long time, the cholesterol hardens and tends to settle in the arteries. This hardening of cholesterol in the arteries is thus termed as clogging. Although unhealthy eating is the most significant cause, many people suffer from this problem due to diseases such as, diabetes, high blood pressure, rheumatism, obesity, etc. In some people, too much of mental stress for a prolonged period of time, is also the causative factor for this problem.