Lower back pain: how to differentiate common causes and when it could be related to the kidneys
Pain in the lower back is one of the most frequent reasons for consultation. Many people immediately associate it with poor posture, contractures or muscle wasting, but this pain does not always have a mechanical origin. In certain cases, the lower back can be the place where the body reflects an internal problem, especially when the kidneys are under stress.
Understanding how to differentiate muscle pain from a kidney signal can make a big difference in detecting a problem in time that, if ignored, can silently advance.
How does kidney pain manifest itself?
Pain associated with the kidneys is usually felt in the lower back, but it is not the same as typical contracture pain. Generally:
- It is located deeper and on the sides of the spine
- It can feel like internal pressure
- Does not improve with changes in posture
- It is sometimes accompanied by burning when urinating, changes in urine color, or swelling
When these symptoms appear together, the body could be signaling that the kidneys are struggling to properly filter toxins.
Why drinking water alone isn’t always enough
There is a belief that the more water you drink, the better your kidneys work. However, kidney filtration depends not only on the volume of fluid, but also on its composition.
This is where a key substance comes into play: citrate.
Citrate helps prevent minerals such as calcium from clumping together to form crystals that can turn into stones. Without enough citrate, even good hydration can be insufficient to protect the kidneys.
Citrate-rich foods such as lemon, lime, and other citrus fruits can help create an environment less prone to stone formation.
The “healthy” vegetable that can damage the kidneys
Some vegetables that are very popular for their health reputation contain high levels of oxalates, substances that can bind to calcium and form crystals in the kidneys.
These include:
- Spinach
- Swiss chard
- Beetroot
- Almonds
It does not mean that they should be eliminated completely, but their excessive consumption, especially in concentrated green juices, can overload the kidneys and promote the formation of stones.
Sugar and Kidney Filtration
Excess blood sugar produces a process called glycation, which damages proteins and the walls of the kidney’s small filters, called glomeruli.
When this occurs, the kidneys lose efficiency and become more vulnerable to inflammation and chronic damage. Therefore, a diet high in sugars and refined flours not only affects the pancreas, but also the renal system.
The Silent Danger of Painkillers
Many common pain medications, such as nonsteroidal anti-inflammatory drugs (NSAIDs), can affect blood flow within the kidney. Frequent or prolonged use can reduce filtration capacity and accelerate kidney damage, especially in people with high blood pressure, diabetes, or dehydration.
24-hour protocol to support kidney function
A simple and consistent approach can help reduce the burden on the kidneys:
Morning
- A glass of water with a few drops of fresh lemon
- Low-sugar breakfast
During the day
- Constant hydration, not excessive
- Avoid sugary drinks
- Eat vegetables low in oxalates such as cucumber, broccoli or cauliflower
Afternoon
- Reduce salt intake
- Avoid ultra-processed snacks
Night
- Light dinner
- Avoid anti-inflammatories without medical indication
- Sleeping well to facilitate kidney repair processes
When to see a doctor?
You should seek medical attention if your low back pain is accompanied by:
- Dark, foamy, or bloody urine
- Swelling in the feet or face
- Persistent fatigue
- Fever or burning when urinating
These may be signs that the problem is not with the muscles, but with the kidneys.
Important notice:
This content is educational and informational only. It is not a substitute for professional medical diagnosis or treatment. In the event of persistent or worrying symptoms, always consult a health professional.
Watch the following video from Dr. Pedro Vidal’s channel, all this vital information is detailed:
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