Salt....it causes a retention of fluid in the body, especially in joints, which in turn increases pressure in sensitive nerves. It can also cause stiffening or tightening sensation in hands that usually is very noticeable first thing in the morning. So reduce salt/sodium intake and increase water intake. Over the counter anti-inflammatory pain medications that contain ibuprofen (advil,Morton etc) work very well for symptom relief. Feel better soon!
Sugar and any unhealthy, processed food. Go to library for books on natural healing for arthritis. Unfiltered, raw apple cider vinegar, from a health food store not the grocery, is something I use. We are all different chemically, Goody Powders are my best OTC relief. If not sold in your state, available on eBay.