Low magnesium can happen for different reasons. Some people do not get enough from food, while others lose too much through the digestive system or kidneys.
Possible causes include long-term poor intake, heavy alcohol use, digestive disorders, chronic diarrhea, some medications, diabetes-related losses, and kidney-related issues. Cleveland Clinic explains that hypomagnesemia can happen when there is low magnesium in the blood and may occur alongside low calcium and potassium.
Who May Be More at Risk?
People who may need extra caution include older adults, people with digestive conditions, people with diabetes, people with alcohol use disorder, and people taking certain medications such as some diuretics or acid-reducing medications for a long time.
If you are taking regular medication, ask a doctor or pharmacist before adding magnesium supplements.
Best Food Sources of Magnesium
Many people can support healthy magnesium intake through food. Good sources include:
spinach
pumpkin seeds
almonds
cashews
peanuts
black beans
lentils
whole grains
brown rice
oats
dark chocolate in moderation
avocado
bananas
The NHS lists spinach, nuts, and wholemeal bread as good sources of magnesium and says most people should be able to get enough magnesium from a varied, balanced diet.
Should You Take Magnesium Supplements?
Magnesium supplements may help some people, but they are not for everyone. Too much magnesium from supplements can cause diarrhea, nausea, abdominal cramping, and in high amounts may be dangerous, especially for people with kidney problems.
The NHS says taking 400 mg or less per day of magnesium from supplements is unlikely to cause harm for most adults, but taking too much can be harmful.
Do not take high doses without medical advice, especially if you have kidney disease, heart problems, low blood pressure, or take medication.
How Is Magnesium Deficiency Checked?
A doctor may order a magnesium blood test if symptoms or risk factors suggest a problem. MedlinePlus explains that a magnesium blood test may be used when symptoms such as fatigue, weakness, muscle cramps, numbness, tingling, irregular heartbeat, or seizures are present.
Sometimes doctors also check calcium, potassium, kidney function, and other markers because magnesium balance is connected to other electrolytes.
When to See a Doctor
Speak with a healthcare professional if you have persistent muscle cramps, weakness, tingling, loss of appetite, vomiting, unusual fatigue, or heart palpitations.
Seek urgent care if you have chest pain, fainting, severe weakness, confusion, seizures, trouble breathing, or a new irregular heartbeat.
Final Thoughts
Magnesium is important for muscles, nerves, energy, bones, and heart rhythm. Low magnesium may cause fatigue, weakness, cramps, nausea, tingling, mood changes, or irregular heartbeat, especially when levels become more serious.
The safest first step is to improve magnesium-rich foods and ask a healthcare professional if testing or supplements are needed. Avoid guessing with high-dose supplements, especially if you already have kidney problems or take medication.
Disclaimer: This article is for general educational information only and does not replace medical advice, diagnosis, or treatment. Always speak with a healthcare professional before starting supplements, especially if you have a medical condition or take medication.
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