We all know that sharp pain

What are muscle cramps?

Muscle cramps are sudden, usually painful contractions of a muscle or a group of muscles that occur without conscious control. There is an abrupt and sustained contraction of the affected muscle that does not relax as it normally would. This tightening can be felt externally as a hardening or tension in the muscle and is often accompanied by severe pain. Typically the cramp lasts only a few seconds to minutes, but the muscle may remain tender for some time afterwards.

Such cramps can occur almost anywhere in the body, with the calves and the soles of the feet especially commonly affected. This is partly due to the load and structure of these muscles. Muscle cramps often occur during or after physical exertion, but they can also happen at rest, e.g. at night during sleep.

Physiologically, a muscle cramp is characterised by a disturbance in the interaction between nerve signals and muscle fibres. Normally, a precisely controlled mechanism ensures that muscles contract on command and then relax. In a cramp this regulatory circuit is disturbed and the muscle remains tense without conscious influence. This happens involuntarily, i.e. independently of one’s will.

What causes muscle cramps?

The exact causes of muscle cramps are not yet fully understood. However, it is known that muscle function is largely controlled by signals from the nervous system. These nerve impulses are transmitted via electrolytes such as potassium, sodium or calcium. For a long time it was assumed that an imbalance of these minerals was the main trigger for cramps – especially with heavy sweating during sport. Although such a deficiency can promote cramps, this link has not been conclusively proven scientifically. Many people still experience cramps even with adequate mineral intake.

Newer theories suggest that overexcitability of certain nerve cells in the spinal cord during physical exertion contributes to the development of cramps. Factors such as unusually high load, poor fitness or shortened muscles can further amplify this neuronal response. Dehydration, high heat and monotonous training are also considered possible triggers.

Health-related factors also play a role: metabolic disorders such as diabetes, hormonal changes in pregnancy or thyroid diseases can increase susceptibility to cramps. Certain medications, for example diuretics, neuroleptics or antihypertensives, are also suspected of triggering muscle cramps.

Last but not least, cramps can in rare cases indicate more serious conditions, for example circulation problems or early venous thrombosis. Older people and pregnant women are particularly affected because of altered fluid and mineral balance.

Does magnesium help against muscle cramps?

Although magnesium is important for many bodily functions – for example for muscle control, energy metabolism and nerve conduction – its effectiveness for muscle cramps has so far not been convincingly demonstrated. Magnesium is often recommended as a remedy for cramps, especially in sport or pregnancy, but the scientific evidence is still cautious.

Significant studies are especially lacking in non‑pregnant people. Several clinical trials found no significant difference between magnesium supplements and placebos. Studies in older patients or athletes also failed to demonstrate a clear benefit, neither in the frequency nor the intensity of cramps. Only in some studies in pregnant women was a limited positive effect observed. However, the number of participants was too small to draw reliable conclusions.

Recent findings also suggest that other electrolytes such as potassium or sodium may play a larger role in muscle cramps than magnesium. Neuromuscular control also appears decisive, for example during heavy physical exertion that overloads the nervous system and thus favours cramps.

When should I see a doctor for muscle cramps?

Muscle cramps are usually harmless, but they can sometimes point to a serious health problem. If cramps occur with unusual symptoms such as chest, abdominal or arm pain, numbness or muscle weakness, a doctor should be consulted immediately. Medical evaluation is also required if cramps occur after severe fluid loss, e.g. from vomiting, heavy sweating or taking diuretics.

If muscle twitches or cramps recur repeatedly, especially in the legs while walking, and improve when standing, you should also see a doctor. The same applies if symptoms appear after starting a new medication or after excessive alcohol consumption. Frequent and painful muscle cramps that do not disappear despite usual measures also warrant a doctor’s visit to exclude underlying conditions such as thyroid disease or metabolic disorders.

How can I prevent muscle cramps?

To prevent muscle cramps, regular and adequate fluid intake is particularly important, especially during prolonged physical exertion. Still mineral water helps maintain the electrolytes needed by the muscles. During intense activities an isotonic drink or mineral water rich in trace elements may also be useful.

A balanced diet is also crucial. Magnesium‑rich foods such as bananas, whole grain products and nuts support the muscles. Potassium and calcium are also important for good muscle function and should be included in the diet.

Regular exercise strengthens the muscles and improves coordination. Activities such as swimming, hiking or gymnastics are ideal. Complement training with stretching to increase flexibility and prevent muscle tension. Before any sporting activity you should warm up thoroughly. This promotes blood circulation and prepares the muscles optimally for exertion.

What you can do for muscle cramps: useful tips

• A muscle cramp can be interrupted by pulling on the affected muscle. Massage it and lengthen it with your hand. Or try deliberately tensing the opposing muscle.
• Heat is soothing for cramps of any kind. You can use warm compresses, a hot water bottle or a hot bath to relax the muscles.
• If a muscle cramps during sport, relieve the load immediately and drink isotonic drinks preventively. Make sure you warm up the muscles properly before sport and adjust the load accordingly.
• Do stretching exercises for at least a few minutes daily. This helps to avoid muscle cramps. For night cramps, stretch the affected muscles just before going to bed. Sit with your legs extended on the floor and gently pull your toes towards you with your hands. Or press the top of the raised forefoot against a wall while standing.
• Avoid one‑sided, unusual strain and promote good circulation through regular training with stretching.
• Drink enough. This is especially important before, during and after training. Mineral water containing calcium, potassium, sodium and magnesium is best.
• Avoid alcohol, as it causes disturbances in the electrolyte balance and can even provoke cramps.
• Pay attention to ergonomics at the workplace if you sit in front of a screen for several hours a day. A height‑adjustable desk and an ergonomic office chair should be part of your basic equipment. Use every opportunity to move more: for example, take the stairs instead of the lift.
• Much depends on sleeping position. If you sleep on your back, place a rolled pillow under your knees. If you sleep on your stomach, let your feet hang relaxed over the foot of the bed.
• Promote good blood circulation. Short cold stimuli such as Kneipp baths or cold showers are beneficial. You can also elevate your legs or take a cold shower and place a folded towel soaked in cold water on them.
• A US study showed that drinking cucumber water can nearly halve the duration of a cramp. The dosage would be one millilitre of cucumber water per kilogram of body weight. It is suspected that the effect is due to the sour taste in the throat, which can dampen neuronal activity and thus have an antispasmodic effect.
• If you suffer from frequent muscle cramps or experience severe pain, consult your doctor.

Muscle cramps are usually harmless but can be very painful and affect quality of life. However, a healthy lifestyle, regular stretching and adequate fluid intake often make them avoidable.