What Exercise Intolerance Can Mean
Reduced exercise capacity can have several causes.
Common causes include:
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Reduced fitness or deconditioning
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Recent illness
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Stress or poor sleep
Other causes that may need assessment include:
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Heart-related conditions
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Lung or breathing problems
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Anaemia or other medical conditions
Understanding what limits you during activity is key to identifying the cause.
​When to Take Exercise Intolerance Seriously
You should seek medical attention if you have:
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A noticeable decline in your exercise capacity
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Breathlessness or chest discomfort on exertion
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Dizziness or feeling faint during activity
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Symptoms that are new, worsening, or unexplained
If you are unable to exercise as expected without a clear reason, it should be assessed.
Why See a General Physician?
Exercise intolerance often involves multiple systems.
A general physician considers the heart, lungs, blood, fitness level, and overall health to understand what may be contributing to your symptoms.
This is particularly helpful when symptoms are unclear or do not point to a single cause.
How We Assess Exercise Intolerance
A structured assessment typically includes:
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A detailed discussion of your symptoms and activity levels
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Review of your medical history
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Physical examination
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Targeted investigations where appropriate
This helps identify underlying causes while avoiding unnecessary tests.
Related Symptoms
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Breathlessness (shortness of breath)
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Fatigue (ongoing tiredness)
This information is general and not a substitute for medical advice.