Dr says strained rotator cuff. can't move my rt arm up or to side cause it feels tight.can lift it only using my lt hand as support. more than str rc?

Sounds like it.: Those symptoms sound like a more severe injury to the shoulder tissue. May need an MRI to evaluate. A thorough physical could yeild more info.

It's possible.: A strained rotator cuff from an acute or chronic problem or injury can limit mobility over time, especial if there is a frank tear. It can also cause inflammation and if severe enough may lead to an adhesive capsulitis "frozen shoulder" or a bursitis. Best check with an orthopedic or physical medicine ; rehab specialist.