Could my dilated sygmoid colon cause my constipation?

Yes : Although it can be a little of a which came first question, did the chronic constipation lead to a dilated sigmoid colon or did the dilated sigmoid colon cause the chronic constipation.

Depends: Why is your sigmoid colon dilated? Is there a blockage of material or tumor or spasm distal to the dilation? Were you told that your sigmoid colon was dilated after a colonoscopy? If so what did the physician who did the scope tell you.