Is it uncommon to have rls in your arms?

Yes: Yes, it's uncommon, but not unheard of. A more appropriate way to think of RLS should be restless limb syndrome, in that it can affect both upper and lower extremities. That being said, the legs are much more common. Good luck!

RLS in arms: Although restlessness is much more common in legs, it may occur in arms. If it is associated with pain, weakness, numbness then you may need to see a neurologist to ensure this is not a different cause such as a neck problem.

A bit unusual: Do agree with dr fine, as the vast majority of cases have leg involvement exclusively, but on occasion, patients may complain of associated arm issues. Note, as mentioned, need to be careful here and rule out carpal tunnel and cubital tunnel issues, as well as even thoracic outlet syndrome, and cervical dysfnctns.