Possible causes of breathing difficulties include environmental stimuli and mild health concerns, states Healthline. More serious medical conditions, such as lung and heart diseases, may also result in breathing problems.
Exposure to allergens, such as mold, pollen and dust, may lead to breathing difficulty in some people. Others may become short-winded after ascending to a higher altitude, such as during mountain climbing. People who are tense, anxious or have respiratory blockages may also experience labored breathing.
Lung conditions that can trigger difficulty in breathing include asthma, pneumonia, pulmonary embolism, chronic obstructive pulmonary disease, pulmonary hypertension, epiglottitis, hiatal hernia and croup. Likely causes of breathing problems that are related to heart conditions include coronary artery disease, heart failure, heart attack, congenital heart disease and irregular heart patterns, notes Healthline.