By Abigail L. Cuffey

The names may sound off, but these potentially serious syndromes are very real. Here's what you should know.
Frozen Shoulder
What it is: A condition that occurs when the shoulder capsule (tissue around the joint) thickens, causing pain and limiting motion. It can worsen over weeks or months. Frozen shoulder is twice as common in women as in men and typically crops up between ages 40 and 65.
What causes it: Usually nothing in particular- it often happens out of the blue, says Stephania Bell, PT , an orthopedic clinical specialist and member of the American Physical Therapy Association. But it can be linked to diabetes, thyroid disease or a previous shoulder injury.
What helps: Physical therapy and exercises that stretch and strengthen your shoulder. Most people see significant improvement within one year, says Bell. You can find a physical therapist in your area at moveforwardpt.com.
Restless Legs Syndrome (RLS )
What it is: A neurological
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