ISLAMABAD  – Shifa International Hospital on Sunday organized a hiking trip on Trail 3 to mark the World Health Day, highlighting this years theme `High Blood Pressure.’ Many doctors, citizens and their families participated enthusiastically in this activity to promote healthy lifestyle among masses. On the occasion, Consultant Medical Specialist at Shifa International Hospital Dr Shahzad Siddique said high blood pressure is considered as “silent killer”.High blood pressure is also known as raised blood pressure or hypertension and it increases the risk of heart attacks, strokes and kidney failure. If left uncontrolled, high blood pressure can also cause blindness, irregularities of the heartbeat and heart failure.  The risk of developing these complications is higher in the presence of other cardiovascular risk factors such as diabetes. One in three adults worldwide has high blood pressure. The proportion increases with age, from 1 in 10 people in their 20s and 30s to 5 in 10 people in their 50s. However, high blood pressure is both preventable and treatable.  In some developed countries, prevention and treatment of the condition, together with other cardiovascular risk factors, has brought about a reduction in deaths from heart disease. The risk of developing high blood pressure can be reduced by reducing salt intake; eating a balanced diet; avoiding use of alcohol; taking regular physical activity; maintaining a healthy body weight; and avoiding tobacco use. World Health Day was celebrated across the globe on April 7. The theme of World Health Day for 2013 was high blood pressure.