I am the mother of a child with diabetes not a medical person. I have done a lot of research and have not seen anything that relates constipation to diabetes. I would ask your doctor to test your child for diabetes. I have heard of the problem of constipation causing lack of energy and irratavlilty. My daughter has that problem which she deveolped recently. We have seen specialtist and we were told that it was not diabetes related. Our daughter was put on a slightly higher fiber diet and it has regulated the problem.
Hope everthing will be ok.
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I am also the mother of a child with diabetes and agree with JDRF team wak. My son had weightloss, thirst, etc. It is great that you are having him checked for diabetes. It is better to know sooner than later. If he doe's have diabetes, please feel free to contact us again. I have found that the support of JDRF has been a personal lifeline for me. Best of luck.
JDRF dm