Can a Partially Deflated Implant Cause Pain?

A deflated breast implant, does not usually cause pain when fixed promptly. Silicone filled breast implants should be replaced promptly. When the breast implants are saline filled, there is not the same urgency; however, when left deflated for months, the capsule around the implant begins to shrink. The implant begins to fold, and can "poke" from the inside. The muscle can also cramp from the irritation. Discomfort can range from none, to mild cramping, to occasional sudden pain that resolves quickly. Once this begins, it is unlike to resolve without removal or replacement of the implant. Pain that is progresive, unrelenting and worsening, may be due to other problems, and should be investigated promptly.

Yes, women with failing saline implants sometimes complain of pain. It seems most of the time the burning in nature. I'm not sure the reason for it since saline in the implant is isotonic with the body

You could have a slow leak.  Pain can occur if the shrinking implant folds over onto itself, particularly on the outside edge of the breast.  Pain should always be worked up because it can reflect other issues in the breast.  I fully appreciate the economic issue in this financial climate; it has affected patients of mine under similar circumstances.  The cost of a replacement implant should be met by the manufacturer's warranty but you would have to pay the surgical and anesthesia fees.