What happens when your body is low on sodium?
Low blood sodium is common in older adults, especially those who are hospitalized or living in long-term care facilities. Signs and symptoms of hyponatremia can include altered personality, lethargy and confusion. Severe hyponatremia can cause seizures, coma and even death.
When sodium levels are too low: The body's ability to send signals is interrupted so the brain overcompensates and sends too many electrical impulses. Eventually, these signals overwhelm the muscle, preventing it from relaxing and manifesting in muscle twitches or cramping.
A biological explanation for this is that the lack of salt and accompanying dehydration causes the spaces between the cells of the muscles to contract, which then increases pressure on the nerve terminals, leading to pain.
In elderly patients with a diet poor in protein and sodium, hyponatremia may be worsened by their low solute intake. The kidney's need to excrete solutes aids in water excretion. An increase in dietary protein and salt can help improve water excretion.
The medical team will restore the sodium level over the course of several hours or days, depending on the severity of your condition.
A number of studies have demonstrated that hyponatremia is associated with various inflammatory conditions7,14-18).
So, the most common reason for low sodium is a kidney problem. When the kidneys are not functioning normally, which can be seen in chronic kidney disease or even temporary dehydration, the body holds too much water. And the proportion of sodium compared to water in the body lowers the sodium level.
Foods with a high sodium level can be particularly problematic as the amount of salt can restrict blood flow, contributing to numbness as a symptom of peripheral neuropathy. Potato chips, cold cuts, and fast food are all particularly high in sodium and should be avoided whenever possible.
Salt – Eating too much sodium causes your cells to retain water and swell. This leads to an inflammatory reaction which can contribute to joint damage. 3. Fried food - Foods high in saturated fats, such as French fries and donuts can increase inflammation in the body and make arthritis pain worse.
Hyponatremia occurs when your blood sodium level goes below 135 mEq/L. When the sodium level in your blood is too low, extra water goes into your cells and makes them swell. This swelling can be dangerous especially in the brain, since the brain cannot expand past the skull.
How does low sodium affect muscles?
However, low sodium intake may have adverse effects on muscle strength, because muscle contraction requires nerve impulse, generated by the rapid influx of sodium ions into the neuron. Restriction of sodium intake adversely affects the renin–angiotensin–aldosterone system and increases muscle sympathetic nerve traffic.
- Intravenous fluids. Your doctor may recommend IV sodium solution to slowly raise the sodium levels in your blood. ...
- Medications. You may take medications to manage the signs and symptoms of hyponatremia, such as headaches, nausea and seizures.

Tolvaptan (Samsca) is used to treat hyponatremia (low levels of sodium in the blood) in people who have heart failure (condition in which the heart cannot pump enough blood to all parts of the body), syndrome of inappropriate antidiuretic hormone (SIADH; condition in which the body produces too much of a certain ...
- Frozen, salted meat or fish.
- Processed meats like ham, corned beef, bacon, sausage, luncheon meats, hot dogs, spare ribs, salt pork, ham hocks, meat spreads.
- Canned meat or fish.
- Breaded meats.
- Canned beans like kidney, pinto, black-eyed peas, lentils.
- Frozen dinners or side dishes with salt.
Increasing salt intake increased sodium excretion, but also unexpectedly caused the kidney to conserve water. Excess sodium was thus released in concentrated urine. This method of protecting the body's water was so efficient that the men actually drank less when their salt intake was highest.
Whether you're swimming in the ocean or drinking salt water as part of a fad diet, swallowing too much of the liquid can have serious health consequences. The human body was built to handle just small amounts of sodium, and salt overload can cause levels to skyrocket.
Patients with hyponatremia had a hospital stay of 7.6 days compared with 5.6 days for those with normonatremia, a significant difference between the groups.
1. Influenza Virus and other Respiratory Viruses. In general population community-acquired pneumonia (CAP) is one of the most common viral infections associated with hyponatremia.
Known offenders include acetazolamide, amiloride, amphotericin, aripiprazole, atovaquone, thiazide diuretics, amiodarone, basiliximab, angiotensin II receptor blockers, angiotensin-converting enzyme inhibitors, bromocriptine, carbamazepine, carboplatin, carvedilol, celecoxib, cyclophosphamide, clofibrate, desmopressin, ...
Low serum sodium levels are independently associated with diabetic peripheral neuropathy (DPN), even within the normal serum sodium range, in patients with type 2 diabetes (T2D), according to results of a retrospective study published in Journal of Diabetes Research.
How does sodium affect nerves and muscles?
Sodium helps maintain a healthy balance of fluids in the body, helps nerves transmit electrical impulses, and helps muscles contract and relax normally.
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Conditions that can cause nerve pain include:
- infections such as shingles and HIV/AIDS.
- multiple sclerosis.
- diabetes.
- stroke.
- cancer and its treatment with radiation, surgery or chemotherapy.
- trapped nerves, such as in carpal tunnel syndrome.
A diet lower in sodium may have an anti-inflammatory effect and help reduce pain and inflammation in some people with arthritis.
Too much potassium, known as hyperkalemia, can impact your kidney function and cause heart arrhythmia, nausea, and an irregular pulse. Too much calcium, known as hypercalcemia, can lead to fatigue, lethargy, seizures, and bone and joint pain.
- Intravenous fluids. Your doctor may recommend IV sodium solution to slowly raise the sodium levels in your blood. ...
- Medications. You may take medications to manage the signs and symptoms of hyponatremia, such as headaches, nausea and seizures.
When hypoosmolality arises at a rate that exceeds the brain ability to regulate its volume by electrolyte losses, such as in acute hyponatremia (<48 hours), brain edema may occur and the patients can develop severe neurological signs and symptoms, possibly leading to death for brain herniation [7,20].
People who have low levels of vitamin D often have joint pain. Vitamin D supplements may treat joint pain in some people who have a vitamin D deficiency. However, research doesn't support that people with healthy levels of vitamin D take should take these supplements for joint pain.
While painful, usually you can treat them yourself. Exercise, dehydration, and menstruation are common causes. One way to stop cramps is to stretch or massage your muscles and to eat enough of these key nutrients: potassium, sodium, calcium, and magnesium.
Animal and cell studies have indicated a direct connection as scientists have watched a high-sodium diet prompt immune cells, like T-cells, to produce more proinflammatory cytokines. In fact, a high-salt diet can lead to autoimmune disease in mice, more evidence of increased inflammation.
- Confusion and irritability.
- Diarrhea or constipation.
- Fatigue.
- Headaches.
- Irregular or fast heart rate (arrhythmia).
- Muscle cramps, muscle spasms or weakness.
- Nausea and vomiting.
- Numbness or tingling in limbs, fingers and toes.
Can low electrolytes cause leg pain?
When electrolyte levels become too low, it can cause leg pain. For example, when sodium, which attracts water to cells, is depleted, cells straining to compensate for the lack of fluid can bring on painful cramps.
Dehydration can cause joint pain because of the lubricating effect it has on the joints. It's estimated that 70 – 80% of your joint cartilage consists of water. Synovial fluid is the thick lubrication located between the joints, giving you a cushion so the bones don't come in contact.