Query: Chest sensation is one symptom of pulmonary embolism.

Relevant passages:
Shortness of breath <=SEP=> Shortness of breath , also known as dyspnea , is a feeling like one can not breathe well enough . The American Thoracic Society defines it as `` a subjective experience of breathing discomfort that consists of qualitatively distinct sensations that vary in intensity '' , and recommends evaluating dyspnea by assessing the intensity of the distinct sensations , the degree of distress involved , and its burden or impact on activities of daily living . Distinct sensations include effort/work , chest tightness , and air hunger ( the feeling of not enough oxygen ) .   Dyspnea is a normal symptom of heavy exertion but becomes pathological if it occurs in unexpected situations or light exertion . In 85 % of cases it is due to asthma , pneumonia , cardiac ischemia , interstitial lung disease , congestive heart failure , chronic obstructive pulmonary disease , or psychogenic causes , such as panic disorder and anxiety . Treatment typically depends on the underlying cause .

Pulmonary embolism <=SEP=> Pulmonary embolism ( PE ) is a blockage of an artery in the lungs by a substance that has traveled from elsewhere in the body through the bloodstream ( embolism ) . Symptoms of a PE may include shortness of breath , chest pain particularly upon breathing in , and coughing up blood . Symptoms of a blood clot in the leg may also be present such as a red , warm , swollen , and painful leg . Signs of a PE include low blood oxygen levels , rapid breathing , rapid heart rate , and sometimes a mild fever . Severe cases can lead to passing out , abnormally low blood pressure , and sudden death .   PE usually results from a blood clot in the leg that travels to the lung . The risk of blood clots is increased by cancer , prolonged bed rest , smoking , stroke , certain genetic conditions , estrogen-based medication , pregnancy , obesity , and after some types of surgery . A small proportion of cases are due to the embolization of air , fat , or amniotic fluid . Diagnosis is based on signs and symptoms in combination with test results . If the risk is low a blood test known as a D-dimer will rule out the condition . Otherwise a CT pulmonary angiography , lung ventilation/perfusion scan , or ultrasound of the legs may confirm the diagnosis . Together deep vein thrombosis and PE are known as venous thromboembolism ( VTE ) .   Efforts to prevent PE include beginning to move as soon as possible after surgery , lower leg exercises during periods of sitting , and the use of blood thinners after some types of surgery . Treatment is typically with blood thinners such as heparin or warfarin . Often these are recommended for six months or longer . Severe cases may require thrombolysis using medication such as tissue plasminogen activator ( tPA ) , or may require surgery such as a pulmonary thrombectomy . If blood thinners are not appropriate , a vena cava filter may be used .   Pulmonary emboli affect about 430,000 people each year in Europe . In the United States between 300,000 and 600,000 cases occur each year , which results in between 50,000 and 200,000 deaths . Rates are similar in males and females . They become more common as people get older .