Vitamin D plays an important role in bone strength, muscle function, and overall health. Many people do not realize their vitamin D levels may be low because the symptoms can be mild or easy to ignore. However, doctors say certain signs may suggest it is time to ask about a vitamin D blood test. Low vitamin D can sometimes cause fatigue, bone pain, muscle weakness, or mood changes, though some people may have no symptoms at all.
Feeling tired from time to time is normal, especially after poor sleep or
