My first symptom was waking up with clenched hands, took a couple of hours before they'd straighten out. It's definitely an indicator for RA, so some blood tests (RF, Inflammatory Markers, etc) would be a good starting point.
21, Male, England.
Dx: Psoriatic Arthritis, Chronic Back Pain, Dyspraxia
Rx: 25mg Methotrexate Sub-Cut Injection & 50mg Etanercept (Enbrel) Sub-Cut Injection
Oh, and plenty of Tramadol, Codeine, Diclofenac, Diphenhydramide, Paracetamol, and SCOTCH.