QUESTION:
My husband has type 2 diabetes and stage IV metastatic prostate cancer involving lymph nodes and the liver. During the past week, his blood sugar has been much higher after he fell on ice. Could the fall have raised it? Could the cancer be spreading and causing the increase?
Quick Answer
Yes, a fall can temporarily raise glucose through pain, physical stress, reduced activity and inflammation. However, a rise lasting a week should not be assumed to be stress alone. High glucose does not prove that prostate cancer has progressed, but advanced cancer, infection, dehydration, altered eating and cancer treatments—especially prednisone, dexamethasone and androgen-deprivation therapy—can worsen diabetes. Contact his oncology or diabetes team promptly to review the readings, symptoms, fall injuries and full medication list.
Answer by Dr. Albana Greca, MD, MMedSc
Hello,
The higher readings need investigation rather than being dismissed or assumed to prove cancer progression.
Yes. Injury and pain raise stress hormones, causing the liver to release glucose and insulin to work less effectively. Reduced movement may add to the rise.
A mild rise may settle as pain improves. Persistent increases may reflect injury, infection, dehydration, medicine effects or inadequate diabetes treatment.
Because prostate cancer can involve bone, new focal pain or inability to bear weight after a fall needs prompt fracture assessment. Sudden leg weakness, groin numbness, or loss of bladder or bowel control requires emergency evaluation.
Not by itself. Glucose is not a prostate-cancer progression marker. Progression is assessed through symptoms, examination, appropriate laboratory tests and imaging.
Liver metastases may alter nutrition and metabolism, but they do not predictably cause only low glucose. Levels may rise, fall or fluctuate. The original insulin-breakdown explanation was incorrect.
Review our high and low blood sugar guide.
Ask about prednisone, dexamethasone, abiraterone, hormone therapy, chemotherapy and pain medicines. Steroid-related rises may be greatest after meals and later in the day.
Do not stop steroids suddenly. Some regimens require prednisone, and abrupt withdrawal can be dangerous. Oncology and diabetes teams should coordinate changes.
Fasting checks alone may miss treatment-related rises. His team may request more checks or continuous monitoring. See our time-of-day guide.
Contact the team the same day for persistent rises, repeated readings around 250–300 mg/dL or higher, thirst, excess urination, fever, infection signs or poor fluid intake.
When ill and glucose is at least 240 mg/dL, ketone testing may be advised. Follow his sick-day plan and do not stop diabetes medicine independently.
Seek emergency care for vomiting with inability to keep fluids down, deep or difficult breathing, severe dehydration, confusion, unusual drowsiness, moderate or large ketones, a meter reading “HI,” or very high glucose with rapid deterioration.
Glucose still matters. Marked hyperglycemia can worsen thirst, dehydration, fatigue, confusion, infection risk and wound healing and may disrupt treatment.
Goals can be individualized. With comfort-focused care, testing may be simplified while preventing symptoms and emergencies. Palliative care can help with pain and treatment burden.
Do not wait for a routine appointment if readings remain much higher than usual. Review our control guide and kidney guide.
This educational answer does not replace urgent review by the oncology and diabetes teams.
Click here to post comments or follow up
Ask the Doctor now? Simply click here to return to Type 2 diabetes information.