I am also having the same problem, lows in the high 30's and 40's and I barely notice it. I am a little tired but no other symptoms.
I am a type 1 diabetic and I see my doctor every 3-4 months. This last visit I talked to my doctor about not being able to feel my lows. Her advice is to keep your sugars high, but not as high as suggested by mrscora01.
The advice I got is to keep BG around 150 for 1-2 weeks and it is very important not to have any lows of BG less than 100! Since I have never done this and I have been a diabetic for 20 years my Dr. told me I should do this for 2 weeks to reset my low BG sensitivity. I am on a pump with a glucose sensor so I can get a good idea of what my BG is doing. I discussed how to set my pump to allow me to stay higher than normal with my Dr and the following is what we decided on: 1) to make sure I am not going low I reduced my basal insulin by about 10%, 2) I changed the target range for my bolus wizard to around 145 which will cause the wizard to not give me extra insulin if my BG is less than 145 and will also subtract from the bolus if it is lower, 3) changed my insulin sensitivity (given for a correction) in the bolus wizard so the bolus wizard thinks the same amount of insulin will reduce my BG more, 4) changed my carb ratios for the bolus wizard and increased the value slightly. All of these steps will give me less insulin for a meal and a high reading so I can remain higher. In addition since I use a glucose sensor I had to change the sensor targets for alerts since I will be higher and so that I will get an alert when I drop lower than I should to try and get sensitivity back. I set my glucose limits for the sensor to a min of 130 and a max of 225. These are much higher than I would normally want but then the pump will alert me when I am dropping and predict if I will go below 130 giving me time to correct so I don't drop below 100.
The opinions expressed in WebMD Communities are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. Communities are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service or treatment.
Do not consider Communities as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.