Vitamin D and Muscle Weakness.

A ubiquitous, vitamin-D deficiency is still unrecognized a n d u n d e r d i a g n o s e d . P r o x i m a l m u s c l e w e a k n e s s i s a c o m m o n symptom of vitamin-D deficiency and occurs before biochemical signs of its deficiency appears. Therefore, vitamin-D deficiency should be kept in the differential diagnosis for the muscle weakness, as it is reversible and easily treated with vitamin-D supplementation.