Unit Statistical Report. Data, including losses and payroll by classification, resulting from every workers' compensation insurance policy written in California is reported to the WCIRB in a Unit Statistical Report (USR).
Carpal tunnel syndrome can cause left arm weakness. Tendinitis can cause left arm weakness. Left arm weakness can be an early sign of a heart attack. A sprained elbow can be the cause of left arm weakness. Typing on a keyboard can be hard on the wrists, possibly aggravating carpal tunnel problems. A pinched nerve in the neck may cause left arm weakness.
While overuse injuries such as tennis and golferâs elbow are common causes of elbow pain, other conditions can include: 1  radiohumeral bursitis â bursitis is inflammation of a bursa. 2  osteoarthritis â the joint cartilage becomes brittle and splits.