Pain and stiffness in your shoulder can make every activity, including sleep, difficult. Worsening shoulder pain, especially at night, could mean you have a frozen shoulder, says Dr. Christopher Camp, a Mayo Clinic orthopedic surgeon.
"The scientific name that we give it is adhesive capsulitis, and, basically, it's a condition when the shoulder gets tight and you can't move it very well," says Dr. Camp.
He says frozen shoulder happens when the lining that goes around the shoulder joint gets inflamed, possibly the result of a small injury. It thickens over time, forming scar tissue.
