Hi, this symptom could be due to panic attacks/anxiety, hiatus hernia, obesity, allergies (dust/pollen),
respiratory diseases like COPD, bronchiolitis, pneumonia, epiglottitis or heart problems like angina or
arrhythmia. You should visit a Physician for a diagnosis. The diagnosis is based on history, physical check up
and tests like blood test (arterial blood gases), X ray of chest, pulmonary function test, ECG or
echocardiogram. The treatment depends on the cause. Hope this helps you. Take care and regards!