By removing toxins and excess salt from the body, the kidneys play an important role in preserving the health and fitness of the body. It purifies and filters blood, regulates blood pressure, and helps to maintain the acid-base balance in addition to generating urine. The kidney's dysfunction can be a sign of several renal conditions, including stones, infections, damage, and cancer. Common signs and symptoms include severe lower back pain, blood in the urine, nausea, vomiting, fever, chills, or bad-smelling or murky urine. As a result, if one notices any signs of kidney stones, they should consult Dr. Niren Rao, widely known as the best kidney doctor in Delhi, at Delhi Urology Hospital.