Shortness of breath, also known as dyspnea, is a condition where a person feels an uncomfortable sensation of not getting enough air. It can occur during physical activity, at rest, or even while sleeping. Various factors can contribute to this feeling, including asthma, chronic obstructive pulmonary disease (COPD), and anxiety. This symptom can range from mild to severe and may be temporary or chronic. It is important to identify the underlying cause, as it can be related to respiratory, cardiovascular, or other health issues. If shortness of breath persists, seeking medical attention is recommended for proper evaluation and treatment.