Researchers have been trying to answer these very questions. Because the immune system is very complicated, one theory is that not everyone has exactly the same kind of rheumatoid arthritis. The good news is that there continues to be new treatments made available when one drug stops working.
Treatments and Individuals
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?