My blood sugar reading is over 250 mg/dL. What should I do?
A blood sugar reading consistently above 200–250 mg/dL signals poor glucose control or acute insulin deficiency. Left unmanaged, severe high sugar can lead to dehydration, ketoacidosis, and blood vessel strain. Senior Physician Dr. Vishnu Anjan Nareddy provides same-visit HbA1c reviews and medication adjustments in Tirupati.
When to seek care
- Blood sugar above 350 mg/dL accompanied by nausea or vomiting
- Rapid, deep breathing with fruity breath odor (Diabetic Ketoacidosis - DKA)
- Severe confusion, drowsiness, extreme weakness, or disorientation
- Severe abdominal pain or inability to retain fluids
- Fever accompanied by very high, unmanageable sugar spikes
- Fasting sugar consistently above 180 mg/dL or post-meal sugar above 250 mg/dL
- Excessive thirst, frequent nighttime urination, and dry mouth
- Blurry vision that has worsened over the past few days
- Unexplained weight loss despite eating normally
- Recent illness or steroid treatment causing persistent sugar elevation
- Fasting blood sugar 80 to 130 mg/dL
- Post-meal sugar below 180 mg/dL
- HbA1c below 7.0% (or personalized target)
- No symptoms of excessive thirst, hunger, or urination
Common possible causes
Frequently asked questions
Should I double my diabetes tablet if my sugar is 300?
No. Never double oral medications without doctor advice, as this can trigger dangerous rebound low blood sugar (hypoglycemia) hours later. Drink water and contact your physician.
Why did my sugar spike when I have a fever?
When fighting an infection, the body releases cortisol and adrenaline, which counteract insulin and spike blood glucose. The underlying infection must be treated alongside the sugar.
Dr. Vishnu Anjan Nareddy
Professor of Medicine-Senior consultant physician · Open until 10 pm daily.