Internal Medicine
Causes of Low Blood Sugar
Reviewed by the JordanMedHub Medical Editorial Team · 9/12/2026
Quick Answer
Low blood sugar is most common in people treated for diabetes, but several other factors can cause it too — here's what to know.
In this article
Low blood sugar happens when glucose in the bloodstream drops too low to properly fuel the body, most often as a side effect of diabetes treatment.
In People With Diabetes
- Insulin or certain oral medications — taking more than the body needs relative to food intake and activity is the most common cause
- Skipping or delaying a meal after taking insulin or medication
- Unplanned physical activity without adjusting food or medication
- Drinking alcohol, especially without eating
In People Without Diabetes
Less commonly, low blood sugar can occur due to certain medications, hormone deficiencies, some tumors that affect insulin production, heavy alcohol use, or after certain types of stomach surgery. This is far less common than diabetes-related hypoglycemia and usually needs specific medical evaluation to identify the cause.
Our symptoms of low blood sugar guide covers how to recognize it and what to do.
Disclaimer
This guide is for general education only and does not diagnose or recommend treatment for any individual. Frequent low blood sugar episodes should be discussed with a doctor, since they may mean a medication dose needs adjusting.
Frequently Asked Questions
Can skipping a meal cause low blood sugar?
Yes, especially for people taking insulin or certain diabetes medications — skipping or delaying a meal after taking them is one of the most common causes.
Written by JordanMedHub Medical Editorial Team
Updated 9/12/2026
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