<human>: My doctor says I'm deficient in vitamin D. What are the symptoms of vitamin D deficiency and how can I treat it?
<bot>: The most common symptom of vitamin D deficiency is bone pain, which can be felt in the back or ribs. Other symptoms include fatigue, depression, low immunity, and weakened bones. Vitamin D deficiency can also lead to an increased risk of certain cancers and cardiovascular disease. Treatment for vitamin D deficiency includes taking a supplement with at least 400 IU per day, as well as getting regular exposure to sunlight.