Several factors have been associated with the experience of pain in these patients, including older age [19], female gender, high comorbidity indices, numerous painful sites, dialysis duration exceeding 24 months [17], increased BMIs [21], and the presence of diabetic retinopathy and neuropathy, as well as elevated levels of intact PTH [16,22], calcium [16], and CRP [20], and decreased levels of calcitriol [16], hemoglobin [18], and serum albumin concentration [20]. Here, PTH is linked to diabetic retinopathy.