Renal Insufficiency/Chronic Kidney Disease
What is Renal Insufficiency/Chronic Kidney Disease?
Chronic kidney disease, also called renal insufficiency, happens when your kidneys gradually lose their ability to filter waste from your blood. Your kidneys are two bean-shaped organs that clean your blood, balance fluids, and remove toxins through urine. When they stop working well, waste products and excess fluid build up in your body.
Kidney disease develops in stages, from mild damage to complete kidney failure. In early stages, you may not notice any symptoms at all. Over time, damaged kidneys struggle to maintain the right balance of minerals, control blood pressure, and produce hormones that keep your bones strong and your blood healthy.
About 37 million American adults have chronic kidney disease, but most do not know it. Regular blood testing helps catch kidney problems early, when lifestyle changes and medical care can slow the damage and protect your remaining kidney function.
Symptoms
- Fatigue and weakness that does not improve with rest
- Swelling in your ankles, feet, or hands from fluid retention
- Shortness of breath from fluid buildup in the lungs
- Changes in urination, such as foamy urine or urinating more at night
- Nausea, vomiting, or loss of appetite
- Trouble concentrating or mental fog
- Dry, itchy skin that does not respond to lotion
- Muscle cramps, especially in the legs
- High blood pressure that is hard to control
- Metallic taste in the mouth or bad breath
Many people with early kidney disease have no symptoms at all. Damage can occur silently for years before you feel anything. This is why regular blood testing is essential, especially if you have diabetes or high blood pressure.
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Causes and risk factors
Diabetes and high blood pressure cause about two out of every three cases of chronic kidney disease. High blood sugar from diabetes damages the tiny blood vessels in your kidneys over time. Uncontrolled blood pressure puts extra strain on the kidney filters, wearing them down year after year. Other causes include glomerulonephritis, a group of diseases that inflame the kidney filters, polycystic kidney disease, prolonged obstruction from kidney stones, recurrent infections, and certain medications taken over long periods.
Your risk increases if you are over age 60, have a family history of kidney disease, smoke cigarettes, or are obese. African Americans, Hispanics, Native Americans, and Asian Americans face higher risk than other groups. Heart disease also raises your risk because the same blood vessel damage that harms your heart can damage your kidneys. Catching these risk factors early gives you the best chance to protect your kidney function.
How it's diagnosed
Doctors diagnose chronic kidney disease through blood and urine tests. The most common blood test measures creatinine, a waste product that healthy kidneys filter out. Your doctor uses your creatinine level to calculate your estimated glomerular filtration rate, or eGFR, which shows how well your kidneys are filtering. An eGFR below 60 for three months or longer indicates chronic kidney disease. Urine tests check for protein or blood, which should not be present if your kidneys are working properly.
Additional tests help identify the underlying cause and monitor kidney function over time. Methylmalonic acid, or MMA, is primarily removed by your kidneys. When kidney function declines, MMA levels rise in your blood even if your vitamin B12 levels are normal. Rite Aid offers MMA testing as an add-on to help monitor kidney function through Quest Diagnostics locations nationwide. Regular testing helps you and your doctor catch changes early and adjust your treatment plan.
Treatment options
- Control blood sugar if you have diabetes through diet, exercise, and medications
- Lower blood pressure to 130/80 or below with lifestyle changes and medications
- Follow a kidney-friendly diet lower in sodium, phosphorus, and potassium
- Limit protein intake as your doctor recommends to reduce kidney workload
- Take ACE inhibitors or ARBs to protect kidney function and lower blood pressure
- Avoid NSAIDs like ibuprofen that can damage kidneys further
- Stay active with at least 30 minutes of movement most days
- Quit smoking to improve blood flow to your kidneys
- Maintain a healthy weight through balanced nutrition
- Work with a nephrologist, a kidney specialist, as disease progresses
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- Results in days, not weeks
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Frequently asked questions
These terms describe the same condition. Renal insufficiency is an older term meaning your kidneys are not working at full capacity. Chronic kidney disease is the current medical term that describes any long-term decrease in kidney function. Both refer to progressive kidney damage that lasts three months or longer.
Kidney damage usually cannot be reversed, but you can often slow or stop further decline. Early detection and treatment give you the best chance to preserve remaining kidney function. Controlling blood sugar and blood pressure, following a kidney-friendly diet, and taking prescribed medications can prevent the disease from getting worse.
If you have diabetes or high blood pressure, test your kidney function at least once per year. People with known kidney disease may need testing every three to six months. Your doctor will recommend a testing schedule based on your risk factors and current kidney function. Regular testing catches changes early when treatment works best.
Elevated MMA can indicate vitamin B12 deficiency or declining kidney function. Your kidneys normally remove MMA from your blood. When kidney function drops, MMA accumulates even if your B12 levels are normal. Your doctor will look at MMA alongside other kidney tests like creatinine and eGFR to get a complete picture of your kidney health.
Limit foods high in sodium, phosphorus, and potassium as your kidney disease progresses. Reduce processed foods, canned soups, lunch meats, and salty snacks. Watch intake of dairy products, nuts, beans, bananas, oranges, and tomatoes, which are high in phosphorus or potassium. Your doctor or dietitian will create a specific eating plan based on your lab results and disease stage.
Most people with chronic kidney disease never need dialysis. Only those who progress to stage 5 kidney failure require dialysis or a kidney transplant. Early detection and good management can prevent disease progression. About 90 percent of people with kidney disease are in stages 1 through 3, where lifestyle changes and medication can maintain function for many years.
Yes, certain medications can harm your kidneys, especially if taken long-term or in high doses. NSAIDs like ibuprofen and naproxen are common culprits. Some antibiotics, proton pump inhibitors, and contrast dyes used in imaging tests can also cause damage. Always tell your doctor and pharmacist about your kidney disease so they can choose safer alternatives.
Some forms of kidney disease run in families, like polycystic kidney disease. Having a parent or sibling with kidney disease increases your risk. Conditions that lead to kidney disease, such as diabetes and high blood pressure, also have genetic components. If kidney disease runs in your family, regular screening and preventive care are especially important.
Damaged kidneys cannot activate vitamin D, which your body needs to absorb calcium. Low calcium and imbalanced phosphorus weaken your bones over time, a condition called renal bone disease. Your kidneys also produce less of a hormone that signals your body to make red blood cells. This leads to anemia, which causes fatigue and weakness.
Yes, regular physical activity helps protect your kidneys and improve your overall health. Exercise lowers blood pressure, controls blood sugar, and helps maintain a healthy weight. Aim for 30 minutes of moderate activity like walking most days of the week. Talk to your doctor before starting a new exercise program, especially if you have advanced kidney disease.