Your kidneys play a vital role, processing blood and getting waste products out of the body. When the kidneys are not functioning properly, it is because their capacity to filter blood and waste is diminished. Kidney problems result from damage to the nephrons --- small units inside the kidneys that help remove waste. More than 26 million people in the United States suffered from chronic kidney disease in 2010, according to the National Kidney Foundation. Symptoms are not usually noticeable until the disease is advanced, and the damage is severe. See your doctor if you suspect you're having kidney trouble.
Urinary Changes
Changes in your normal urinary pattern can be a sign of a kidney problem. Some people begin urinating more frequently, especially at night, but other notice a decrease in urination, the National Kidney and Urologic Diseases Information Clearinghouse reports. Changes in urinary frequency can be a sign of several medical conditions, and should be reported to your doctor.
Swelling
When your kidneys are not functioning at full capacity, you can develop swelling. Swelling and fluid retention because of kidney disease is most often noticeable in the wrists, ankles, and eyes, according to the University of Maryland Medical Center. Puffiness and swelling around the eyes is most often noticeable in the morning.
Loss of Appetite
A kidney problem can often cause a significant decrease in appetite, according to the National Kidney Foundation. Some people also experience bouts of nausea and vomiting.
Fatigue
When your kidneys aren't working properly, you can frequently feel fatigued or drowsy, according to the National Kidney and Urologic Diseases Information Clearinghouse. Some people have trouble concentrating, and feel tired all the time. In some cases, people may also have trouble sleeping.
Skin Changes
When the kidneys begin to fail, your skin may become darker, according to the National Kidney and Urologic Diseases Information Clearinghouse. In some sufferers, skin also gets dry and itchy, or may feel numb.


