Great question! Yes, blood sugar can spike quickly even without eating, and it can absolutely cause dizziness. Here are the main reasons this can happen:
- The Dawn Phenomenon — While sleeping, hormones like cortisol, glucagon, and growth hormone signal the liver to release stored glucose into the bloodstream, raising Show Full Answer
Great question! Yes, blood sugar can spike quickly even without eating, and it can absolutely cause dizziness. Here are the main reasons this can happen:
- The Dawn Phenomenon — While sleeping, hormones like cortisol, glucagon, and growth hormone signal the liver to release stored glucose into the bloodstream, raising blood sugar before you even wake up
- Stress & Adrenaline — A rush of adrenaline (from stress, fear, or excitement) triggers glucagon to release stored sugar from the liver into the blood
- Fasting too long — During extended fasting, the body releases stored glucose to keep energy levels up, which can cause a spike As for dizziness, rapid blood sugar changes — whether high or low — can definitely cause it. High blood sugar (above 180 mg/dL) can make you feel disoriented and unsteady.
A drop in blood pressure after these spikes can also reduce blood flow to the brain, causing dizziness. Inner ear dysfunction, which is more common in people with diabetes, can also play a role.
If dizziness is frequent or comes with nausea, chest pain, confusion, or fainting, it's worth checking in with a doctor right away.
May 8
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