How Does Vitamin D Deficiency Cause Bone and Back Pain?

How does vitamin D affect your bones?

Vitamin D controls how well your gut absorbs calcium from food. Without enough vitamin D, your body cannot move calcium into your bones efficiently. Over time, this means bones lose mineral density and become softer. The medical term for this in adults is osteomalacia.

Your body makes vitamin D when ultraviolet B (UVB) rays from sunlight hit your skin. It is then converted in the liver and kidneys into its active form (cholecalciferol). When this chain is disrupted, whether by low sunlight, diet or other factors, the whole process of bone mineralisation slows down.

This is why vitamin D deficiency bone pain tends to be deep and diffuse rather than sharp. It is the bone itself that is weakened, not a single nerve or disc. People often describe it as a constant, dull ache that does not seem to have a clear trigger.

What are the symptoms of vitamin D deficiency?

The symptoms are often vague and easy to dismiss. Many people live with them for months before connecting them to low vitamin D. The most common signs include bone pain, muscle pain and general fatigue.

Why is vitamin D deficiency so common in the UK?

The UK sits at a high latitude. From October to March, UVB rays from the sun are too weak to trigger vitamin D production in the skin. NHS guidance states that everyone in the UK should consider a supplement during the winter months for this reason.

Other risk factors include covering most of your skin for cultural or personal reasons, digestive conditions that affect fat absorption (vitamin D is fat-soluble), and certain medications. Your GP can advise on whether you fall into a higher-risk group.

Can a standing scan help if vitamin D treatment hasn't fixed my back pain?

Yes, it can. If you have corrected your vitamin D levels and the bone pain has improved but your back still hurts, the pain may have a structural or alignment component as well. This is where ScanAlign standing EOS imaging is useful.

Standard lying-down scans relax your muscles and temporarily remove the effect of gravity on your skeleton. That can mask problems like subtle pelvic tilts, leg-length differences or spinal imbalances that only appear when you stand. An EOS scan captures your entire skeleton in a single standing image, using about 90% less radiation than a standard X-ray, around ten times less. This gives your clinician a clear view of how your bones and joints actually line up under load.

Your body is a connected chain from your feet to your head. A tilt in the pelvis or a slight difference in leg length can cause your spine to compensate, leading to persistent lower back pain that has nothing to do with vitamin D. A standing scan helps separate a nutritional problem from a mechanical one.

How can you raise your vitamin D levels?

The most reliable first step is to see your GP for a blood test. This confirms whether your levels are genuinely low and how low they are. From there, your GP can recommend the right course of action for you.

NHS guidance suggests that all adults in the UK consider taking a vitamin D supplement during autumn and winter. Some people, especially those with darker skin, limited sun exposure or existing health conditions, may benefit from year-round supplementation. We do not recommend specific doses here. Your GP is best placed to advise on the amount that is right for you based on your blood results.

Dietary sources include oily fish (salmon, sardines, mackerel), egg yolks and fortified foods such as some cereals and plant milks. However, it is difficult to get enough vitamin D from food alone, which is why sunlight and supplementation are important.

Frequently asked questions