Leg cramps
A cramp is a sudden, involuntary tightening of a muscle that you cannot release by willpower.
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Medicines commonly prescribed for Leg cramps
For informational purposes only. Always consult a doctor before using any medicine.
Dosage form: ORAL SOLUTION/SUSPENSION, 100 mg paracetamol/mlActive substance: paracetamolManufacturer: Ferrer Internacional S.A.Prescription not requiredDosage form: TABLET, 500 mg paracetamolActive substance: paracetamolManufacturer: Laboratorios Normon S.A.Prescription not requiredDosage form: TABLET, 1 g paracetamolActive substance: paracetamolManufacturer: Neuraxpharm Spain S.L.Prescription required
A cramp is a sudden, involuntary tightening of a muscle that you cannot release by willpower. The calf is affected most often, less commonly the arch of the foot, the toes or the back of the thigh. The episode hurts, but it is almost always harmless and short.
More than half of adults get them at least occasionally, and after fifty considerably more often. A cramp usually arrives at night or at rest, when the muscle is relaxed and shortened: you wake up because the calf has gone hard as stone and for a few minutes you cannot move the leg at all.
How an attack runs its course
The muscle stiffens, and you can see and feel it as a tight knot while the foot is pulled into a pointed position. The pain is sharp and, at its peak, severe. It lasts from a few seconds to about ten minutes; a cramp should not go on longer than ten minutes, and if it does, something else is going on.
Once the muscle lets go it often stays sore to walk on and tender to touch for a day, sometimes a little longer. That is a normal after-effect rather than a sign of damage.
In pregnancy, night cramps in the calves are commonplace in the last months and on their own point to no disease at all. In children, similar night pains in the shins — often called growing pains — are also common, but with one important proviso: the child is well in the morning, does not limp, has no swollen joints, and the pain is not always in the same spot.
What to do while it is happening
There is no need to wait it out — the muscle can be made to release.
- Straighten the knee and pull the toes towards you, using your hands, a towel or a belt if you cannot reach. This is the main manoeuvre and it works almost every time.
- Stand up and put your weight on the affected leg, leaning slightly forwards. Walk a few steps.
- Rub the muscle and apply warmth — a hot water bottle or a warm shower. For the soreness left the next day, cold works better instead.
Painkillers are no use during the cramp itself: a tablet begins to work half an hour later, long after it has finished. Paracetamol or an anti-inflammatory only make sense the following day, if the muscle is aching badly.
Why legs cramp
In most people no cause is ever found, and that is not carelessness on the doctor's part: ordinary night cramps in the calf usually stay unexplained. Some things are known, though.
- Age. Over the years there are fewer muscle fibres and fewer nerve endings controlling them, and the muscle tips into spasm more easily.
- Unaccustomed or excessive exertion, especially in heat and with heavy sweating. Long periods standing on a hard floor and work spent on your feet belong here too.
- Not enough fluid and loss of salts: through vomiting, diarrhoea, water tablets or a very restricted diet.
- Pregnancy, usually in the second half.
- Medicines. The usual culprits are water tablets, blood pressure medicines, beta-agonist inhalers that widen the airways, and statins. If cramps started within a few weeks of a new prescription, mention it to your doctor — sometimes changing the drug is enough.
- Long-term conditions: serious liver damage including alcohol-related liver disease, kidney failure and dialysis in particular, an underactive thyroid, and diabetes with nerve damage.
A word on salts and supplements. Low potassium, calcium or magnesium can genuinely cause muscle spasm, but in a healthy person these are rarely low without a reason, and taking magnesium blindly is not a treatment. In pregnancy magnesium supplements sometimes help; in other adults there is no convincing evidence of benefit.
What gets mistaken for a cramp
This is the most important part of the subject: several conditions feel similar but need a completely different response.
- Deep vein thrombosis. One calf hurts, the pain does not fade in minutes but goes on for hours and days; the leg is swollen, warm to the touch, and the skin has changed colour. Stretching does not help. This needs a doctor the same day, and if sudden breathlessness, chest pain or coughing up blood appear, call an ambulance on the single European number 112.
- Artery disease in the legs. Calf pain comes on predictably, always after the same walking distance, and settles after standing still for a few minutes. The foot is cool and pale, hair on the shin thins out, and small wounds take weeks to close. If the leg starts to hurt at night and eases when you hang it out of bed, the blood supply is already critically low and this cannot wait.
- Restless legs syndrome. Not pain but an unbearable urge to move the legs, which builds in the evening and goes as soon as you get up and walk. It is treated differently, and the first step is checking iron stores.
- Nerve and muscle disease. What is worrying is cramp that has spread from the legs to the hands and trunk, muscle twitching visible under the skin at rest, weakness that keeps increasing, wasting of the muscles and tripping. That combination needs a neurologist.
- Muscle damage. If someone on statins develops not brief cramps but widespread muscle pain with weakness, and the urine turns dark like tea, they need to be seen urgently and should not take the next dose meanwhile.
How to make them less frequent
Not everyone gets rid of cramps altogether, but spacing them out is realistic.
The mainstay is stretching the calf muscles regularly. Stand facing a wall a step away, place your palms against it, take one leg back, straighten that knee, keep the heel pressed to the floor and lean your body forwards until you feel a pull behind. Hold for about half a minute, then swap legs. Do this twice a day and always before bed. The effect is not immediate — judge it after three or four weeks.
What else helps:
- moving every day — walking or cycling, including on an exercise bike;
- drinking enough in the heat and during exertion, and after heavy sweating replacing salts as well as water;
- building up training gradually rather than all at once after a long break;
- wearing stable footwear and, with flat feet, asking about insoles;
- not tucking the bedding tightly under the mattress — it pushes the foot into a pointed position and invites a night cramp.
Quinine, once prescribed for stubborn cramps, deserves a separate mention: it can cause a sharp fall in platelets and disturb heart rhythm and hearing, which is why it is no longer recommended for routine use. Whether the risk is ever worth taking is for a doctor to decide, and only once everything else has been tried.
When you need a doctor
Book an appointment if:
- cramps come almost every night and rob you of sleep;
- attacks last longer than ten minutes or leave weakness in the leg;
- alongside the cramps there is numbness, pins and needles, persistent swelling or a change in skin colour;
- they began after a new medicine was started;
- they appear in someone with kidney, liver or thyroid disease, or with diabetes.
The same day if one calf is painful and swollen and feels hot and the pain does not settle; if urine has turned dark after an episode; or if cramps come with repeated vomiting or diarrhoea and signs of dehydration.
Online consultation
A remote appointment suits this subject well: from your description the doctor can separate an ordinary cramp from arterial pain on walking and from restless legs syndrome, go through your medicines for the ones that provoke spasm, advise which blood tests are worth doing, and show you how to stretch the calf so that the exercise actually works.
If, however, one calf has suddenly swollen and become painful, a conversation at a distance is not enough — that needs an examination in person the same day.
This material is for information only and does not replace medical advice.
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