Is there a cure for ra?

Variable. Since rheumatoid arthritis (RA) is a condition of intermittent exacerbations (flares) and quiescence, it is impossible to know if a patient has reached a state where no future flares will occur. Instead, the term remission is used to indicate prolonged quiescence. Remission is highly variable, but can be achieved with some of today's drugs. More often, treatment modification is ongoing.
No, but... There are no cures for ra, but there are treatments that modify disease progression. Traditional approaches use nsaids, physical therapy, steroids, dmards (disease modifying antirheumatic drugs) and biologics. Alternative treatments are also aimed at reducing stress and inflammation in the body through nutrition and detoxification.
NO. There is no cure for migraine but can be managed with one or multiple medications including oral and injectable drugs.