There doesn't seem to be a whole heap of ESFj love around, but these guys definitely have a bad yen for being 'needed'. When taken advantage of, this can to leed an ESFj into thinking only of others and neglecting their own needs.
ESFj = Emotional masochist
Chivalry is only a name for that general spirit or state of mind which disposes men to heroic actions, and keeps them conversant with all that is beautiful and sublime in the intellectual and moral world
- Kenelm Henry Digby
ISFJs are often unappreciated, at work, home, and play. Ironically, because they prove over and over that they can be relied on for their loyalty and unstinting, high-quality work, those around them often take them for granted--even take advantage of them. Admittedly, the problem is sometimes aggravated by the ISFJs themselves; for instance, they are notoriously bad at delegating ("If you want it done right, do it yourself"). And although they're hurt by being treated like doormats, they are often unwilling to toot their own horns about their accomplishments because they feel that although they deserve more credit than they're getting, it's somehow wrong to want any sort of reward for doing work (which is supposed to be a virtue in itself). (And as low-profile Is, their actions don't call attention to themselves as with charismatic Es.) Because of all of this, ISFJs are often overworked, and as a result may suffer from psychosomatic illnesses.