Why do drugs like Enbrel and Humira work for some people with RA and not for others? Why do some people develop an immunity to these drugs faster than others?

What is bursitis? What causes it? How is it teated?

My father has been diagnosed with polymyalgia rheumatica but now is having joint pain in his fingers? Could he have RA?

Is calcium important for patients with arthritis? What about other vitamins?

Can RA go into remission?