what causes shortness of breath and dizziness
A heart deprived of oxygen causes the heart to work harder, resulting in shortness of breath. The restriction of blood flow to the heart leads to less oxygen-rich blood reaching the tissues of the body, which produces fatigue. A lack of blood and oxygen to the brain causes dizziness.
Some heart rhythm disorders can cause a fluttering in the chest, shortness of breath, chest pain or dizziness.