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It is normal to have constipation
during the first few days of surgery , due to the medications given during surgery .
But it should get back to normal in 2-3 days .
firstly are you passing flatus (gas) and small amounts of stool ?
If not , then the cause could be neurogenic , as a consequence of your back surgery.
for which you have to go back to your surgeon .
you need to follow these simple steps to avoid constipation .
1. take plenty of fluids
2. exercise regularly
3. do not starve yourself
4. you can also take syp. duphalac
15 ml at bed time for a period of 1 week . but do not over use it.
if not relieved by the above steps then see a gastroenterologist