There is weight gain, depression, sensitivity to heat and cold, muscle weakness, cramps, fatigue, panic attacks,
memory loss, infertility and hair loss in this condition. People suffering from hypothyroidism may have low levels of vitamin D due to poor absorption from the gut. Low levels of vitamin D have been linked to the development of autoimmune diseases. Vitamin D deficiency can also be correlated to the presence of anti-thyroid antibodies and abnormal thyroid function tests.