Most of us already know that vitamin D matters for our bones. As we get older (especially for women after menopause), keeping vitamin D levels up is one of those things doctors mention regularly. And for good reason.
But here is something many people don’t know yet. Vitamin D may also play a real role in how much pain you feel after surgery. And a new study puts some striking numbers behind that idea.
What Researchers Found
Dr. Mahdy Abdelhady and a team of researchers looked at 184 women undergoing surgery between September 2024 and April 2025. Half had low vitamin D levels. Half had higher levels. The researchers then tracked how each group handled pain.
The results were notable. Women with vitamin D deficiency were about three times more likely to experience moderate to severe pain after their procedure. They also used significantly more opioid medication to manage it, on average, 112 mg more tramadol through patient-controlled pain pumps.
The low-vitamin-D group also needed more fentanyl during surgery itself. And nausea after surgery was more common in that group as well.
For this study, vitamin D deficiency was defined as a blood level below 30 nmol/L. The researchers used that as the dividing line between the two groups.
Why Might This Happen?
Because this was an observational study (meaning the researchers watched what happened rather than running a controlled experiment), they can’t say with absolute certainty what caused the difference. But they believe it likely comes down to how vitamin D affects inflammation and the immune system.
Those two systems also influence how the body responds to injury. When they’re not working well, pain signals may be stronger and harder to manage.
What This Means for You
This research adds one more reason to pay attention to your vitamin D levels, especially if surgery is on your horizon. Beyond bones and immune health, your vitamin D status may shape how your body handles pain when it matters most.
If you haven’t had your vitamin D checked recently, it’s a simple blood test worth asking your doctor about. It won’t hurt to know where you stand.