Signs and Symptoms of Pulmonary Hypertension:

Because symptoms may develop very gradually, patients may delay seeing a physician for years. 
Common symptoms: 

shortness of breath, 

fatigue, 

non-productive cough, 

angina pectoris, 

fainting or syncope, 

peripheral edema (swelling around the ankles and feet), and 

rarely hemoptysis (coughing up blood).

Pulmonary venous hypertension typically presents with shortness of breath while lying flat or sleeping (orthopnea or paroxysmal nocturnal dyspnea), while pulmonary arterial hypertension (PAH) typically does not.

A detailed family history is established to determine whether the disease might be familial. 
A history of exposure to drugs such as cocaine, methamphetamine, alcohol leading to cirrhosis, and tobacco leading to emphysema are considered significant. 

A physical examination is performed to look for typical signs of pulmonary hypertension, including a loud P2 (pulmonic valve closure sound), (para)sternal heave, jugular venous distension, pedal edema, ascites, hepatojugular reflux, clubbing etc. Evidence of tricuspid insufficiency is also sought and, if present, is consistent with the presence of pulmonary hypertension.

Source: wikipedia.org