The blood vessels in human body are divided into two most important paths that carry blood from heart to whole body. One path is meant for supplying blood to the lungs pumped from the right side of the heart, and the other one serves the whole body from the blood pumped by the left side of the heart. This is the main function of the pulmonary arteries present in the human body.

Pulmonary hypertension is caused due to the variations in process of arteries present in lungs. The pulmonary arteries are affected mainly by 3 types of changes:

• It stiffens the blood vessels (artery walls).
• The arteries become stiff due to overgrowth of cells.
• The arteries have blood clot that obstructs the flow of blood.

These changes can have adverse effects on the heart or on other body parts, as the heart is unable to push the required amount of blood into lungs through arteries. As a result, the blood pressure exceeds its limits that the arteries can hold which results in PAH (Pulmonary Artery Hypertension). Several factors can add up to the process of developing different types of PAH. It is sometimes difficult to detect the cause of Group one PAH (Pulmonary Artery Hypertension) or PAH can be hereditary (genes transmitted in offspring’s through parents). These could not be the only reason to cause PAH but other disorders and diseases such as thyroid, HIV and congenial heart diseases can too cause this type of PAH.

Consumption of some dietary medicines and harmful drugs such as cocaine, heroin, hashish and other drugs can also result in this type of PAH. The secondary type of PAH (group two) is caused due to numerous different disorders and diseases same as the primary (group one) PAH. The causes behind secondary (group two) PAH differs from the group one PAH. The group two causes can be due to several valve diseases and disorders, lung diseases, respiratory problems, anemia and Sarcoidosis.       

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