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The New York Heart Association (NYHA) functional classification system is an important method your doctor may use to measure the severity of your symptoms to decide what type of treatment is right for you.2
- Class I
- No limitations in usual physical activity and very mild symptoms.
- Class II
- Normal activity causes some shortness of breath, tiredness, chest pain, or lightheadedness.
- Class III
- Even mild activity causes shortness of breath, tiredness, chest pain, or lightheadedness, and is significantly limited because of these symptoms.
- Class IV
- Shortness of breath, tiredness, chest pain, and lightheadedness, even at rest.
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