What are some of the symptoms if my body starts rejecting the new kidney?

Local pain may occur: However the symptoms are those for kidney failure e.g. Swelling, decreased urine output, and high blood pressure. Rejection is much less likely if all transplant meds are taken with no skipping.

See below : Rejection occurs most often in the first 6 months after transplant and decreases with time. Most rejection episodes do not have symptoms and are detected through routine bloodwork. However, if symptoms do occur, the most common signs of rejection are: flu-like symptoms, fever, decreased urine output, weight gain, fatigue, and pain or tenderness over transplant.