The best way to relieve any arthritic pain is diet.
Remove all sugars, sweeteners, MSG and wheat and avoid food/drink such as red wine, brocolli and red peppers as they aggravate and inflame.
For more instant pain relief rosemary essential oil diluted in a base oil rubbed onto the area helps (though not advised if you have blood pressure. Make sure you're well hydrated and stick to low impact movements (but don't stop moving about). As others have said too, heat pads work well.
Hope the pain lessens soon