Lifestyle

7 Signs of Low Magnesium Most People Blame on Getting Older

By Mike Harper · October 24, 2026

A hand that trembles a little, legs that cramp at night, or a lack of interest in food can seem like ordinary changes that come with age. Sometimes they point to a mineral that rarely gets checked unless a doctor goes looking for it: magnesium.

MedlinePlus says every organ in the body, especially the heart, muscles, and kidneys, needs magnesium, and it also helps build teeth and bones. When the level in the blood drops below normal, the medical name is hypomagnesemia. Cleveland Clinic says it mainly affects the neuromuscular system and the heart, and some people have no symptoms at all.

Older adults deserve a closer look. The National Institutes of Health’s Office of Dietary Supplements lists older people among the groups more likely to get too little magnesium, along with people who have type 2 diabetes, digestive diseases such as Crohn’s or celiac disease, or long-term alcohol problems. It also notes that men older than 70 are among the most likely to have low intakes from their diets.

These are the signs listed by MedlinePlus, Cleveland Clinic, the NIH and the Merck Manual.

Muscle cramps and spasms. MedlinePlus lists muscle spasms or cramps among the common symptoms. Cleveland Clinic groups them with numbness under the term tetany, a sign of mild low magnesium.

Tremors and twitching. Shaky hands are easy to chalk up to nerves or age. Cleveland Clinic lists tremors as a symptom of mild cases, and the Merck Manual includes them as well.

Fatigue and weakness. Cleveland Clinic names both, and the NIH lists them among the symptoms of magnesium deficiency.

Numbness and tingling. Cleveland Clinic describes numbness in the hands and feet. The NIH places numbness and tingling with more extreme deficiency.

Loss of appetite and nausea. The NIH lists loss of appetite, nausea and vomiting among the symptoms. Merck lists them too.

Sleepiness or personality changes. Merck says low magnesium may cause sleepiness and personality changes. Cleveland Clinic lists delirium, a sudden state of confusion, among the signs of severe cases.

An irregular heartbeat. Abnormal heart rhythm is one of the signs of severe hypomagnesemia, according to Cleveland Clinic. It says people with severe symptoms, such as seizures or an abnormal heartbeat, should call 911 or get to the nearest hospital.

Common medicines can play a role. Cleveland Clinic says proton pump inhibitors such as omeprazole, taken for acid reflux, can interfere with how the body absorbs magnesium. Merck points to chronic use of these acid reducers. Some diuretics, or water pills, including hydrochlorothiazide and furosemide, can cause the kidneys to release too much magnesium in urine, according to Cleveland Clinic. Heavy drinking, uncontrolled diabetes and long-lasting diarrhea are other causes.

Low magnesium rarely travels alone. Merck says low calcium and low potassium may also be present, and doctors must correct those at the same time. A blood test checks the level, and MedlinePlus gives a normal range of 1.6 to 2.6 mg/dL, noting that ranges can vary slightly by lab. Treatment depends on how low the level is and may include magnesium by mouth or through a vein.

Food is the everyday source. The NIH says legumes, nuts, seeds, whole grains, green leafy vegetables such as spinach, fortified cereals, and milk and yogurt all provide magnesium. Supplements are a different matter, since the NIH says magnesium from supplements and medicines should stay under set upper limits unless a provider recommends more.

This article is for general information and is not medical advice. Talk with your doctor about any symptoms and before starting supplements or changing your medicines. This article was produced with the assistance of AI and fact-checked against the sources cited by LightWave Reports.