Most herbs that are being suggested above are addressing symptoms at best and not aiding the root cause of the joint pain which is likely degradation of collagen structures in the body; tissues, cartilage etc.
If looking at herbs for treatment, it’s important to consider the tissue state, is the joint pain hot and searing or cold and damp/aching. If it’s cold and damp incorporate a warming herb like rosemary, turmeric or fresh ginger root. If hot, consider a cooling herb like willow bark.
If you need something to treat a bad flare up, teasel and ghost pipe combined is the best combo out there I think.
Whole food vitamin c (not extracted ascorbic acid) is going to really help support rebuilding collagen structures.
Eliminate seed oils which are the most inflammatory substance in our diets today and are almost unrecognizable to our guts microbiome; they’re hidden in everything. Soybean/canola/rapeseed/vegetable oils.
Use organic coconut or olive instead or perhaps animal fats.
Really though, I would be remiss if I didn’t say that getting collagen into your diet would be priority number one to treat the root. That’s gelatinous foods like really dense bone broth made from chicken feet/necks/backs etc. As a recovering vegan myself I see bone broth as a food that uses animal parts that otherwise go to waste and truly honors the gift of that animals life.
As above, so below.
As within, so without.
Best wishes on your healing journey.