Culprit: A Vitamin or Mineral Deficiency
Having low levels of iron or vitamin D or B12 can make you feel tired, anxious, and weak, says Irene Park, a nurse practitioner in New York City. Many experts believe that a significant percentage of the U.S. population is deficient in vitamin D. “And lower levels of vitamin D can cause muscle weakness and pain,” says Keenan. Also, if you’re a woman of reproductive age, you’re statistically at greater risk for iron-deficiency anemia.
The only way to tell if you’re low in any vitamin or mineral is to see your doctor for a blood test. Meanwhile, to bolster your body’s stores, consider taking a multivitamin with at least 100 percent of your daily requirement of vitamins and minerals. (Experts generally advise that healthy adults also supplement with 1,000 to 2,000 international units of vitamin D daily.)