Why does my sugar sometimes spike after exercise?
Hard, intense exercise triggers adrenaline, which tells the liver to dump glucose for fuel. In diabetes the insulin response cannot fully catch that dump, so a sprint session or heavy lifting can briefly raise sugar instead of lowering it.
Gentle steady movement, walking, cycling, swimming, almost always lowers it.
The spike usually settles within an hour or two, and training still improves sugar control overall. Log the pattern and share it; sometimes timing of food or medicine around workouts needs a tweak.
Source: American Diabetes Association, Standards of Care in Diabetes
See a doctor promptly if
- Excessive thirst, frequent urination, blurred vision or unexplained weight loss. These suggest diabetes and need testing, not tracking
- Sweating, shakiness, palpitations or confusion a few hours after eating that resolves with food, especially if repeated
- A fasting glucose of 126 mg/dL (7.0 mmol/L) or more, or an HbA1c of 6.5 percent (48 mmol/mol) or more on repeat testing
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Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
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