High blood pressure is usually caused by obesity, stress, excessive consumption of alcohol, pollution, tobacco smoke and food allergens. When the cause of high blood pressure is unknown, it is called essential or primary hypertension. In case of secondary hypertension, it may include, kidney abnormality, structural abnormality of the aorta existing since birth, and narrowing of certain arteries. Generally said by researchers that in 90% of HBP cases, the cause is unknown. Even someone can have very high blood pressure for years without knowing it, and usually such people do not feel any symptoms. However some patients complain the symptoms of tiredness, dyspnoea, dizziness, swelling in the ankles and legs, bluish lips, chest pain, palpitation, throbbing sensation and discomfort feelings. Patients should avoid to use lot of salt and alcohol.