When it comes to kidney problems or kidney disease, the symptoms can vary widely, and they’re often subtle at first, which is why it’s sometimes called a “silent disease.” From my experience in general and preventive medicine, I’ve seen patients develop kidney issues that creep up on them, and it’s often only when things progress that the symptoms become noticeable. So, knowing what to watch out for early on can make a big difference.
Early Warning Signs
The kidneys play such a crucial role in filtering waste and balancing electrolytes in your body that when they start to have trouble, the signs can show up in unexpected ways.
1. Fatigue and Lack of Energy
This is one of the most common symptoms, and people often brush it off as just being tired from life’s demands. But if you’re feeling constantly drained, even after a good night’s sleep, it might be worth investigating. Kidneys help filter waste out of the blood, and when they’re not working properly, toxins start to build up, which can lead to fatigue and a general feeling of sluggishness.
I remember a patient in her late 40s who came in complaining of feeling “wiped out” all the time. Initially, we thought it was stress, but after some tests, it turned out she had early-stage kidney disease. Once we addressed the underlying issue, her energy levels improved.
2. Swelling in the Legs, Ankles, or Feet
Kidney problems often lead to fluid retention, which shows up as swelling in the lower extremities. The kidneys are responsible for maintaining the body’s fluid balance, and when they aren’t functioning well, excess fluids can build up in tissues, especially around the ankles and feet.
I had a patient who noticed that his shoes were suddenly tight, and he was having trouble putting them on at the end of the day. We ran some tests, and sure enough, his kidney function was impaired. The fluid buildup was one of the first signs.
3. Changes in Urination
This is a big one because your kidneys are directly responsible for producing urine. If you notice any changes in how often you urinate or what your urine looks like, take note. Some changes include:
- Urinating more frequently, especially at night (known as nocturia).
- Foamy or bubbly urine, which could indicate excess protein in the urine, a sign of kidney dysfunction.
- Dark or bloody urine, which could suggest blood in the urine (hematuria), often a red flag for kidney issues.
- Decreased urine output, even when you’re drinking enough fluids.
One of my patients came in because he was having to wake up multiple times a night to use the bathroom. Initially, we thought it might be a bladder issue, but after some tests, we discovered that his kidneys were not filtering efficiently.
4. High Blood Pressure
Kidneys play a key role in regulating blood pressure, so when they’re not functioning well, blood pressure can spike. In fact, high blood pressure can both cause and result from kidney problems, creating a bit of a vicious cycle.
I’ve seen this happen quite often with patients who don’t initially associate their high blood pressure with their kidneys. In one case, a patient in his early 50s had been struggling with uncontrolled hypertension despite medication. After investigating further, we discovered underlying kidney disease, which was contributing to his elevated blood pressure.
5. Metallic Taste in the Mouth or Ammonia Breath
When the kidneys aren’t filtering out toxins properly, those waste products build up in your bloodstream, and one odd symptom of this is a metallic taste in your mouth or breath that smells like ammonia. This is due to a buildup of urea, which the kidneys normally eliminate.
I had a patient who noticed a strange, lingering metallic taste and thought it was just due to some dental issue, but it was actually a sign that her kidneys were struggling to clear waste products from her body.
6. Nausea and Vomiting
As kidney function declines, waste products build up in the blood, leading to symptoms like nausea and vomiting. These are especially common in more advanced stages of kidney disease. It’s not always severe—sometimes, it just feels like mild queasiness that doesn’t go away.
I recall a patient who had been experiencing ongoing nausea for weeks. He chalked it up to indigestion or stress, but when we did some blood work, we found that his kidney function had deteriorated significantly.
7. Itchy Skin
Kidneys help filter waste from the blood, and when they aren’t doing their job, waste can build up, leading to skin irritation and itchiness. This is particularly common in people with advanced kidney disease, but it can occur earlier on too.
I had a patient with chronic itching, especially on her back and arms. She tried different lotions and creams, thinking it was a skin issue, but it turned out to be related to her kidneys not filtering waste efficiently. Once we started addressing the kidney issue, her skin symptoms improved.
8. Shortness of Breath
Kidneys play a role in balancing fluids in the body, and when they aren’t functioning well, excess fluid can build up in the lungs, leading to shortness of breath. Another factor is anemia—when kidneys aren’t functioning well, they produce less of the hormone erythropoietin, which is responsible for making red blood cells. With fewer red blood cells, less oxygen is transported throughout the body, leading to feelings of breathlessness.
I once treated a patient who came in complaining of feeling winded after just a short walk. She wasn’t overweight, didn’t have any known lung issues, but after a few tests, we discovered her kidney function was impaired, and she had developed mild anemia as a result.
9. Back Pain
Although not as common as the other symptoms, back pain (specifically in the lower back or sides) can sometimes be a sign of kidney problems, particularly if the pain is sharp or severe. This could indicate something like kidney stones or a kidney infection (pyelonephritis), which can be very painful.
I had a patient who came in with persistent pain in his lower back, thinking it was a muscle strain from working out. After running some tests, we found out he had kidney stones, which were causing the pain.
When to Seek Help
Kidney disease is progressive, meaning it gets worse over time if not addressed. The key is catching it early. If you notice any of the symptoms I mentioned—whether it’s changes in urination, swelling, fatigue, or high blood pressure—it’s a good idea to see your doctor. The earlier we catch these issues, the better the chances of slowing down any damage.
I always tell my patients: don’t wait until the symptoms become unbearable. With preventive measures and treatments, it’s possible to manage kidney disease and prevent further damage.
Practical Steps You Can Take
If you’re worried about your kidneys or want to keep them healthy, here are some practical tips:
- Stay hydrated, but avoid overhydrating. Drinking water helps the kidneys flush out toxins, but drinking too much water can also strain them.
- Limit salt and processed foods, as high sodium can increase blood pressure and strain the kidneys.
- Keep an eye on your blood pressure, as hypertension is a major risk factor for kidney disease.
- Avoid NSAIDs like ibuprofen for long-term use, as they can damage kidney tissue over time.
- Get regular check-ups and blood tests to monitor your kidney function, especially if you have risk factors like diabetes, high blood pressure, or a family history of kidney disease.
In my years of practice, I’ve seen how making small, consistent changes can lead to significant improvements in kidney health. It’s about being proactive and attentive to your body’s signals. And if something doesn’t feel right, don’t hesitate to get it checked out—it’s always better to catch issues early.
