I have lost 54 pounds in 8 months; 2 months ago started have severe left rib pain, swollen painful lymph nodes, under arm, neck?

Purposeful loss?: If your weight loss was not on purpose or diet concern is another process. You should see your doctor.

Could be serious: Unless you were trying to lose weight you may have a serious condition. The widespread enlarged nodes also can be serious. You need to see your doctor asap.

Wt loss and rib pain: You need to be seen medically immediately to rule put a possible cancer or infection.