Too much vitamin D can sometimes lead to muscle weakness, tiredness, or a general feeling of being unwell.
Possible symptoms include:
* Muscle weakness
* Low energy
* Feeling unusually tired
* Difficulty concentrating
The NIH lists muscle weakness and neuropsychiatric changes among possible effects of vitamin D toxicity-related hypercalcemia. ([ODs][2])
## 3. Excessive Thirst and Frequent Urination
High calcium levels can make you unusually thirsty and cause more frequent urination.
You may notice that you:
* Drink much more than usual
* Wake up at night to urinate
* Urinate larger amounts
* Feel dehydrated despite drinking fluids
These are recognized symptoms of vitamin D toxicity. ([ODs][2])
## 4. Kidney Stones or Kidney Problems
One of the more serious consequences of excessive vitamin D is kidney damage.
High calcium levels can contribute to:
* Kidney stones
* Kidney pain
* Reduced kidney function
* In severe cases, kidney failure
Mayo Clinic specifically notes that vitamin D toxicity can lead to kidney stones and kidney trouble. ([Mayo Clinic][1])
