Dyspnea is a subjective feeling of lack of air, difficulty breathing, or shortness of breath. This symptom can cause most lung diseases (e.g., bronchitis), heart diseases, and some diseases of other organs or poisoning.
Dyspnea in most cases requires contact with a doctor. If dyspnea is so severe that it makes it difficult to speak or is accompanied by chest pain, hemoptysis, or significant weakness, call an ambulance urgently.
