Guide

High blood sugar after fasting usually comes from hormones, liver glucose release, insulin timing, late food, illness, or unrecognized diabetes.

Brief high blood sugar in non diabetics usually stems from food choices, stress, illness, hormones, medicines, or underlying metabolic issues.

In type 1 diabetes, high blood sugar usually comes from a mismatch between insulin, food, activity, illness, hormones, or medicines.

High blood sugar in pregnancy usually stems from pregnancy hormones causing insulin resistance plus weight, genetics, and pre-existing diabetes.

Common causes of high blood sugar in the body include insulin resistance, missed meds, high-carb meals, inactivity, stress, illness, and some drugs.

Low blood sugar in adults usually stems from medicine, food timing, illness, or hormone issues that upset the body’s glucose balance.

Low blood sugar in older adults most often stems from diabetes drugs, missed meals, illness, and age-related changes in how the body handles glucose.

Extremely high blood sugar often comes from missed treatment, large carb loads, illness, or steroid use and always needs fast medical review.

High morning blood sugar usually comes from dawn hormone surges, late-night carbs, missed or low medication, or rebound after low glucose overnight.

Sudden high blood sugar usually comes from food, stress, illness, missed medication, or hormones that block insulin.