Although having a low level of vitamin D is often asymptomatic, you might experience:
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More frequent infections
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Fatigue
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Muscle or bone discomfort
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Depressed mood
If you have any of the following symptoms that are, or can be, associated with a vitamin D deficiency, then you should consult with your health-care practitioner:
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Muscle spasms and twitching (which can be anywhere but are more common in the face and around the mouth or eyes)
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Generalized weakness
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Loss of balance/falling
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Severe bone and joint pain ‐ hip pain is most common
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Unexplained fracture
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An onset of seizures
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Abnormal heart rate or rhythm
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High blood pressure
Potential signs and symptoms of high vitamin D
Although having a vitamin D level that is too high can be asymptomatic, with a very high level (usually a result of excess calcium absorption) you could experience:
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Anorexia/loss of appetite
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Vomiting
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Diarrhea and/or constipation
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Excessive thirst, dry mouth
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Frequent urination
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Fatigue
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Dizziness
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Muscle cramping/pain/twitching
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Bone pain
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Nerve pain (neuropathy)
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Kidney stones
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Confusion and weakness
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Chest pain, irregular heartbeat
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Elevated blood pressure
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Headaches
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Cough, shortness of breath
If you suspect you might have an excess level of vitamin D (which only occurs with excessive supplementation and is very uncommon), then you should consult with your health-care practitioner.