VitalSignsReview

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Category: Blood Sugar

Evidence-checked coverage of blood sugar, prediabetes, and glucose health — every claim traced to NIH, CDC, Mayo Clinic, or peer-reviewed research.

A sunrise over a horizon with a rising glucose line, illustrating the dawn phenomenon

What Causes High Blood Sugar in the Morning?

What causes high blood sugar in the morning: the dawn phenomenon explained, why the rebound theory is largely discarded, how to identify your pattern, and what helps.

August 6, 2026 · 4 min read