### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
re: fasting blood sugar and autonomic neuropathy. I have hyperadrenergic postural orthostatic tachycardia syndrome. mild peripheral neuropathy in my legs with pain and swelling, blurred vision. I am hearing from other friends with POTS that they are finding overlapping sugar issues and wonder if I am in that category. I have many symptoms, which I won t go into regarding my condition, but would like to know if there is new data out about autonomic dysfunction and prediabetes. Also, if catecholamines have anything to do with it. My norepinephrine is high standing. I began testing my glucose at home, and I have a high fasting glucose most days. 100-116. During my period, or when I am cramping it is at about 96-99. I have no other high readings throughout the day. And my a1c was normal at 5.4. But I have always craved sweets to combat my fatigue. Not as much now that I am older (41) but it was always a major factor. My question is, do you know about relationships to diabetes/prediabetes and autonomic dysfunction. And do you think I am heading towards prediabetes. Are high fasting numbers something that should concern me, considering my history with hypertension, tachycardia and neuropathy due to the POTS.

### output:

Hello, Autonomic dysfunction is usually a consequence of chronic diabetes. It is not a risk factor for diabetes. Coming to this point, as long as your HbA1C is normal, there is no reason to worry about diabetes. Nevertheless, considering high fasting glucose levels, I would recommend performing a glucose tolerance test, just to be sure that everything is okay. Hope you will find this answer helpful. Let me know if I can assist you further. 