According to Wikipedia:In medicine, pulmonary hypertension (PH or PHT) is an increase in blood pressure in the pulmonary artery, pulmonary vein, or pulmonary capillaries, together known as the lung vasculature, leading to shortness of breath, dizziness, fainting, and other symptoms, all of which are exacerbated by exertion. Pulmonary hypertension can be a severe disease with a markedly decreased exercise tolerance and heart failure.
Pulmonary hypertension is a rare disease caused by elevated pulmonary pressure due to no visible cause.
To put things in laymens term :
1.Heart has two types of vessels one artery and the other veins.
2.Through a systematic circulation blood from left reaches right and back to lungs for oxygenation.
3.The pulmonary articles are those that carry blood from right side of heart to lungs.
4.The right ventricle pumps blood returning from the body into the pulmonary arteries to the lungs to receive oxygen. The pressures in the lung arteries (pulmonary arteries) are normally significantly lower than the pressures in the systemic circulation. When pressure in the pulmonary circulation becomes abnormally elevated, it is referred to as pulmonary hypertension, pulmonary artery hypertension, or PAH.
Pulmonary hypertension is usually caused by a narrowing of the small arteries of the lung. This narrowing makes it harder for the right side of the heart to circulate the blood to the lungs. Over time, the right side of the heart may become enlarged and then fail.
