As seen in our Peoria Chiropractic office frozen shoulder can occur for no seemingly apparent reason, those who have had a recent injury or whose shoulder has been in a period of immobility seem to have the highest incidence of adhesive capsulitis, perhaps because of the shoulder capsule tightening due to insufficient use. It is uncommon in men and a rare condition for those under age 40; seventy percent of all cases appear in women between ages 40 and 60. Certain systemic diseases also seem to predispose some individuals toward developing frozen shoulder. For instance, those with diabetes have a five times greater likelihood of encountering this disorder. Other risk factors include heart disease, rheumatoid arthritis, Parkinson’s disease, hyperthyroid (overactive thyroid), hypothyroid (underactive thyroid) and lung disease.