dawn phenomenon
The natural rise in blood glucose levels in the early morning hours due to hormonal changes, particularly problematic in diabetes management.
Full Definition
The dawn phenomenon refers to the physiological increase in blood glucose concentrations that occurs in the early morning hours, typically between 4 AM and 8 AM. This rise results from the natural circadian rhythm of counter-regulatory hormones including growth hormone, cortisol, catecholamines, and glucagon, which promote hepatic glucose production. In individuals with diabetes, this normal physiological process becomes exaggerated due to insufficient insulin action, leading to elevated fasting glucose levels. Recognition of the dawn phenomenon is crucial for optimizing diabetes management strategies, including timing of medications and insulin regimens.
Usage
Usage note: Always lowercase unless beginning a sentence; avoid hyphenation.
In Context
- "Continuous glucose monitoring revealed a pronounced dawn phenomenon with glucose rising from 140 to 220 mg/dL between 4-7 AM." — Diabetes management consultation
- "The patient's dawn phenomenon was addressed by adjusting the timing of long-acting insulin administration." — Endocrinology treatment plan