Getting Sick or Infected Often : Vitamin D plays important roles in immune function. One of the most common symptoms of deficiency is an increased risk of illness or infections.
Fatigue and Tiredness: Excessive fatigue and tiredness may be a sign of vitamin D deficiency. Taking supplements may help improve energy levels.
Bone and Back Pain : Low blood levels of the vitamin may be a cause or contributing factor to bone pain and lower back pain.
Depression: Depression is associated with low vitamin D levels and some studies have found that supplementing improves mood.
Impaired Wound Healing: Inadequate vitamin D levels may lead to poor wound healing following surgery, injury or infection.
Bone Loss: A diagnosis of low bone mineral density may be a sign of vitamin D deficiency. Getting enough of this vitamin is important for preserving bone mass as you get older.
Hair Loss: Hair loss may be a sign of vitamin D deficiency in female-pattern hair loss or the autoimmune condition alopecia areata.
Muscle Pain: There is a link between chronic pain and low blood levels of the vitamin, which may be due to the interaction between the vitamin and pain-sensing nerve cells.