Side effects of low vitamin D levels

Vitamin D helps the body handle calcium and maintain bone and muscle function. Some people have no noticeable symptoms. Others may experience fatigue, generalised weakness, aches, or difficulty climbing stairs and rising from a chair. Low mood and frequent infections can occur alongside deficiency, but neither symptom confirms it. Reduced sunlight exposure, limited dietary intake, absorption problems, and some medicines can contribute. Obesity can also affect vitamin D levels. A blood test helps place the result alongside your symptoms, medical history and medicines.

Arrange a clinical assessment if symptoms persist or interfere with movement. A clinician may review diet, sunlight exposure, digestive conditions, kidney or liver problems, and medicines before recommending a supplement. Take only the product and dose advised for you; excessive supplementation can also cause harm. Food sources, safe outdoor activity and a plan for repeat testing may be discussed. Do not stop prescribed treatment without advice.

Seek urgent medical help for a new inability to walk, severe bone pain after a minor injury, confusion, repeated vomiting, or marked weakness that develops quickly. Book a prompt appointment for ongoing pain, repeated falls, or weakness that is worsening. These problems need assessment because they may reflect a fracture, another deficiency, a neurological problem or a different illness rather than vitamin D alone.

Ask which test is appropriate, whether another cause could explain your symptoms, how long supplementation should continue, and whether your medicines or digestive health affect vitamin D absorption. You can also ask what symptoms should prompt earlier review.