What Are the Symptoms of Magnesium Deficiency and How Is It Treated?

Magnesium Deficiency and Muscle Cramps

Muscle cramps, especially among athletes, are often linked to magnesium deficiency. Magnesium is often overlooked as an electrolyte, even though it should be replenished after stress, heavy sweating, and an unbalanced diet. Unlike sodium or potassium, it's difficult to detect a magnesium deficiency through routine blood tests, which makes it harder to interpret symptoms.

Magnesium and muscle function

When experiencing muscle cramps, it's often recommended to stretch the muscle, massage it, or pause the activity. This can help in individual cases, but it doesn't replace the need to restore electrolyte balance – especially for athletes who develop cramps during a competition.

 Muscle cramps can also lead to injuries during intense exercise. Stretching and warming up alone do not restore magnesium levels in the body.

Why Magnesium Is Important

Magnesium plays a role in muscle relaxation, while calcium is involved in muscle contraction. During intense physical activity – especially in hot conditions – a significant amount of magnesium can be lost through sweat, potentially altering the calcium-to-magnesium ratio in tissues.

Heat, sweating and electrolyte balance

High temperatures amplify the risk of muscle cramps due to increased sweating. Magnesium, being water-soluble, is lost more rapidly in sweat than calcium. This imbalance raises the calcium-to-magnesium ratio, which can cause involuntary muscle contractions.

In extreme conditions, such as intense training or military operations in hot climates, athletes and soldiers can lose one to two liters of fluid per hour. The mineral loss can be so severe that salt and mineral residues form visible crusts on clothing.

The limitations of traditional sports drinks

Many sports drinks are primarily made with water, sodium, and sugar, and contain little or no magnesium or potassium. This means that while hydration is ensured, the need for certain minerals may not be fully met.

Heat stress at a glance

Heat-related issues like muscle cramps aren't just influenced by the outside temperature and humidity; they also depend on the body's mineral and fluid balance. Getting enough water and electrolytes helps the body regulate its temperature.

Magnesium Deficiency and Stress

Stress is one of the most common reasons people seek medical help. As early as the early 1980s, Time magazine called stress the “epidemic of the 80s” – an issue that has not lost its relevance since then. Multiple demands in everyday life, constant availability, and economic pressure make it harder for the body to recover.

The American Institute of Stress (AIS) estimates that a significant proportion of GP visits are related to stress.

How stress can affect the body (according to the AIS)

• Heart rate and blood pressure: can rise when you're under stress.
• Blood sugar: Stress hormones can trigger the release of stored energy.
• Blood circulation: can change under stress, benefiting the muscles.
• Blood clotting: can accelerate as part of the body's stress response.

The potential role of magnesium in stress

• Blood vessels: Magnesium plays a role in the normal functioning of muscles, including the smooth muscle in blood vessel walls.
• Blood sugar regulation: Magnesium plays a role in how insulin transports glucose into cells.
• Muscles: Low magnesium levels are often linked to muscle tension and feelings of restlessness.
• General: Magnesium contributes to normal mental function and the normal functioning of the nervous system.[2]

If you experience persistent symptoms such as significantly elevated blood pressure, pronounced blood clotting disorders, or severe stress symptoms, you should always seek medical advice.

Magnesium and the Mind

Persistent symptoms of anxiety or panic should always be assessed by a doctor or psychotherapist, as they can have many different causes and require an individual diagnosis. Medication treatments (e.g., with SSRIs) are prescribed by doctors on a case-by-case basis and should not be changed or discontinued without consulting a doctor.

In addition, research is exploring whether magnesium could play a supporting role in overall well-being:

• Muscle relaxation: Magnesium helps balance calcium, which can contribute to normal muscle function. A deficiency is linked to muscle tension.
• Nervous system: Magnesium contributes to the normal functioning of the nervous system.[2]
• General well-being: Magnesium plays a role in numerous metabolic processes, including those linked to stress management.

Practical tips

• Seek medical advice to rule out anxiety or panic symptoms before taking any action on your own.
• A balanced diet with sufficient protein, fibre, and healthy fats can help maintain stable blood sugar levels.
• Exercise, mindfulness, and getting enough sleep are often cited as helpful ways to manage stress.
• If you're considering a dietary supplement, discuss it with a doctor – especially if you're already undergoing treatment. Dietary supplements should complement a doctor-prescribed treatment, not replace it.

Magnesium Deficiency and Headaches

Tension headaches are often linked to muscular tension in the shoulder and neck area. Magnesium supports normal muscle function, which can help relieve such tension.

A magnesium deficiency isn't the only possible cause of headaches or migraines – if you experience frequent, severe, or unusual headaches, you should always seek medical advice.

Discussed links between magnesium and headaches

Research is examining the following mechanisms, among others:

• Blood vessels: Magnesium is linked to regulating vascular tone.
• Neurotransmitters: Magnesium plays a role in many neurological processes.
• Platelets: There is evidence of a link between magnesium and platelet function.
• Muscle relaxation: Magnesium can help relax muscles.

These links are currently being scientifically investigated; they do not guarantee a soothing effect in individual cases.

Magnesium Deficiency and PMS

Some women report an improvement in their well-being when taking magnesium supplements during the premenstrual phase. Premenstrual Syndrome (PMS) typically occurs 2 to 14 days before menstruation; the exact cause has not yet been conclusively established scientifically.

Magnesium supports normal muscle function and a balanced electrolyte level [2], and is often taken as a supplement for these reasons.

Ways to increase your magnesium intake

• Food sources: green leafy vegetables (spinach, kale), nuts and seeds (almonds, pumpkin seeds), whole grains (brown rice, quinoa), pulses (black beans, lentils), and dark chocolate.
• Food supplements: Forms such as magnesium glycinate, magnesium citrate, or magnesium malate are generally considered well-tolerated.
• Dosage: The usual recommendation is 200–400 mg daily. Talk to a doctor or pharmacist before taking it, especially if you have any existing conditions or are taking other medicines.

Magnesium Deficiency and Pregnant Women

Magnesium is important for many physiological processes, including muscle function, nerve transmission, and the normal development of bone tissue. During pregnancy, the body's need for magnesium increases.

Important: During pregnancy, magnesium – like any other dietary supplement – should only be taken in consultation with your gynaecologist or midwife. Pregnancy complications such as high blood pressure, pre-eclampsia, or premature labour always require medical care; dietary supplements cannot replace such care and should only be taken after consulting a doctor.

Possible signs of magnesium deficiency during pregnancy

Some common symptoms during pregnancy are linked to a possible magnesium deficiency, including:

• Constipation
• Leg cramps
• Back pain
• Water retention
• Irritability
• Sleep problems

Discuss these symptoms with your gynaecologist to determine the cause and decide on the best course of action.

Magnesium and the desire to have children

Magnesium is also discussed in relation to female fertility, including with regard to the muscle function of the fallopian tubes. If you're hoping to have children and have questions about nutrient intake, it's advisable to consult a gynaecologist.

Magnesium for Children

Children also need magnesium for normal muscle and nerve function, as well as for energy metabolism. A balanced, age-appropriate diet is the foundation for a good supply.

Developmental or behavioural issues – such as those linked to ADHD or autism spectrum disorders – are complex and individual, requiring diagnosis and support from a paediatrician or specialist. Dietary supplements are not a treatment for such diagnoses and should only be used after consulting a paediatrician, and never as a substitute for medically recommended therapy.

If you suspect your child has signs of a nutrient deficiency (such as frequent constipation or muscle cramps), discuss this with their paediatrician before considering any nutritional supplements. Dosages for children differ from those for adults and should always be agreed with a doctor.

Magnesium Deficiency and Heart Health

Research shows that low magnesium levels are more common in people with existing cardiovascular diseases. Magnesium plays a role in normal muscle function, including that of the heart muscle.

Important: In some clinics, magnesium is administered intravenously by healthcare professionals for certain acute cardiac events. This is a medically supervised emergency treatment and not comparable to the use of over-the-counter dietary supplements. If you experience symptoms like chest pain, a rapid heartbeat, or shortness of breath, you should always seek immediate medical help (call the emergency services).

Whether and to what extent magnesium supplementation is beneficial for those with existing heart conditions is a matter of debate among experts, and should be discussed on an individual basis with the treating cardiologist.

Magnesium Deficiency and High Blood Pressure

 High blood pressure (hypertension) is one of the most common chronic conditions worldwide. It is usually diagnosed and treated by a doctor, often with diuretics, among other medications. Some diuretics can potentially cause additional magnesium loss as a side effect.

Here's a thought experiment: imagine someone who, over several months, is prescribed various medications for blood pressure, cholesterol, and blood sugar, without stress or magnesium levels ever being addressed. This example is purely illustrative and aims to highlight why it can be beneficial to actively discuss lifestyle factors and nutrient status with your doctor. It does not replace an individual medical assessment and is not a criticism of any specific treatment. High blood pressure, elevated cholesterol levels, and high blood sugar are serious conditions that should always be treated by a doctor.

Key findings

• Stress, age, and certain medications can affect magnesium levels.
• There is scientific debate about a link between magnesium levels and blood pressure, blood lipids, and insulin sensitivity.
• A standard serum test doesn't always reliably reflect the actual magnesium status in tissues, as only a small portion of the body's magnesium circulates in the blood.
• Talk to your doctor about your lifestyle, stress levels, and any nutritional concerns – in addition to, not instead of, any prescribed treatment.

Magnesium and Blood Lipid Levels

Magnesium is involved in the activity of several enzymes that also play a role in fat metabolism, including the conversion of essential fatty acids like omega-3 and omega-6 into prostaglandins.

Scientific studies have examined the link between magnesium levels and blood lipid levels; the results vary depending on the study population and design. A normal magnesium level is part of an overall healthy metabolism, but it doesn't replace medically prescribed treatment for high cholesterol.

Important: If you've been prescribed a statin or another medication to treat high blood lipid levels, discuss any desired changes exclusively with your doctor. Cholesterol is also important for hormone synthesis and cell membrane function – questions about the benefits and risks of treatment should be assessed individually by a doctor.

Magnesium and Blood Sugar

Magnesium plays a role in how insulin works, including how it transports glucose into cells. Research shows that low magnesium levels are more often linked to issues with blood sugar regulation.

A balanced diet and adequate magnesium levels can form part of a healthy lifestyle. However, they are not a substitute for medically prescribed diabetes treatment. If you're taking anti-diabetic medication, discuss any changes to your diet or nutritional supplements with your doctor before making them.

Magnesium in Sport

Athletes are considered particularly susceptible to lower magnesium levels, partly because:

• Magnesium is lost through sweat during exercise.
• Magnesium plays a role in muscle relaxation, while calcium supports muscle contraction.
• It helps balance the calcium-magnesium ratio within the cell.

Low magnesium levels are often linked to muscle cramps and tension, which can make training more difficult.

Magnesium and muscle recovery

• Some athletes use magnesium salts in baths or magnesium citrate supplements to help their muscles relax.
• Animal studies suggest a link between magnesium levels and athletic performance; whether this applies to humans is the subject of further research.
• Magnesium contributes to normal energy metabolism.[2]

If you regularly suffer from muscle cramps, you should consult a doctor to explore not only your nutrient intake but also other possible causes.

Magnesium in the modern diet

Various studies suggest that modern agricultural practices have reduced the magnesium content of many soils – and therefore potentially also of the food grown on them. A report from the National Academy of Sciences indicates that a large portion of the US population does not meet the recommended daily intake of magnesium. Similar observations have also been made for other Western diets.

Challenges in measuring magnesium levels

Only about 1% of the total magnesium in the body is found in the blood; the body tightly regulates this level to protect important functions such as heart muscle contraction. Therefore, serum magnesium tests can yield results within the normal range even when there is an actual deficiency.

Alternative testing methods used in specific medical settings:

• Red blood cell magnesium test: measures magnesium at the cellular level.
• Ionised magnesium in the blood: measures the level of free, biologically active magnesium, but is rarely available.

Discuss with your doctor which test method is most suitable for your individual situation.