What a foot cramp is
Cramps are sudden involuntary contractions of a muscle. In the foot they usually affect the small muscles of the arch and the muscles that curl the toes, which can make the toes claw down or spread apart. The muscle feels hard and very painful, and soreness can remain for hours afterwards.
The exact cause of ordinary cramps is not fully understood. The main theory is that a tired or shortened muscle becomes over-excitable, so the nerve keeps firing and the muscle cannot relax.
Common causes and triggers
- Muscle fatigue after exercise, long walks or standing all day.
- Tight calf, Achilles and foot muscles.
- Footwear that is too tight, too flat or new, and high heels.
- Sitting or sleeping with the feet pointed for long periods.
- Swimming, ballet and other activities that point the toes.
- Dehydration and heavy sweating.
- Flat feet or very high arches, which change how the foot muscles work.
Medical causes to consider
- Pregnancy, especially in the second half.
- Medicines such as diuretics, some blood pressure drugs, statins and some asthma inhalers.
- Diabetes and other causes of nerve damage, which also cause numbness or burning.
- Thyroid, kidney or liver disease.
- Low levels of potassium, calcium or magnesium in the blood.
- Poor circulation, which typically causes calf or foot pain when walking that eases with rest.
If cramps are frequent or new medicines were started recently, talk to your doctor.
How to stop a foot cramp quickly
- Pull your toes and the front of your foot up towards your shin, and hold.
- Stand up and press the foot flat on the floor, putting weight through it.
- Massage the arch firmly with your thumbs or roll it over a ball.
- Walk around or move the ankle in circles.
- Apply warmth, such as a warm towel, to relax the muscle; ice can ease soreness afterwards.
Toe cramps
Toe cramps, where the toes curl down or one toe sticks up, are often linked to tight footwear, fatigue of the small foot muscles and the position of the foot in bed. Gently straightening the toes with your hand, spreading them and walking barefoot on a firm surface usually releases them.
Frequent toe cramps together with numbness, tingling or a feeling of walking on cotton wool should be checked, as they can be a sign of nerve problems.
Stretches and habits that prevent cramps
- Calf stretch: against a wall, back leg straight and then bent, 30 seconds each, before bed.
- Plantar fascia stretch: pull the toes back with your hand while sitting.
- Towel curls and marble pick-ups: strengthen the small foot muscles.
- Footwear: supportive shoes with enough room for the toes.
- Bedclothes: keep sheets loose so the feet are not forced into a pointed position.
- Fluids: drink regularly, especially in heat and during long exercise.
See also charley horse for calf cramps and leg pain at night.
Do magnesium and other minerals help?
Many people take magnesium for cramps, but studies in older adults with ordinary night cramps have found it is unlikely to help. It may be useful if blood levels are low, which a doctor can check. Foods rich in potassium, magnesium and calcium are part of a healthy diet; see drinks high in magnesium.
Quinine is no longer recommended for routine cramps because of the risk of serious side effects. Stretching remains the first-line approach.
When to see a doctor
- Cramps that are frequent, severe or disturbing your sleep regularly.
- Cramps with muscle weakness, wasting or twitching.
- Numbness, tingling or burning in the feet.
- Swelling, redness or warmth in the leg.
- Pain in the calf or foot when walking that eases with rest.
- Cramps that started after a new medicine.
Key points to remember
- Most foot cramps are harmless and linked to fatigue and tight muscles.
- Stretching the toes upwards and standing on the foot stop most cramps.
- Regular stretches, good footwear and hydration help prevent them.
- Frequent cramps or other symptoms need a medical check.
Questions about foot cramps
These answers are general information and do not replace an examination or individual medical advice.
What deficiency causes foot cramps?
Low potassium, calcium or magnesium can cause cramps, but most foot cramps occur with normal levels.
Why do my feet cramp at night?
At night the feet often rest in a pointed position, shortening the muscles. Fatigue and tight calves add to this.
Are foot cramps a sign of diabetes?
Not usually, but diabetes can cause nerve damage that leads to cramps, especially with numbness or burning.
Can dehydration cause foot cramps?
Dehydration and heavy sweating can contribute, especially during exercise in heat.
Why do my toes cramp when I point them?
Pointing shortens the toe muscles, which makes them more likely to cramp, as happens in swimming and ballet.
Can shoes cause foot cramps?
Yes. Tight, flat or unsupportive shoes can tire the foot muscles and trigger cramps.
Sources
- NHS · Leg cramps
- MedlinePlus (NIH) · Muscle cramps
- Nelson NL, Churilla JR. A narrative review of exercise-associated muscle cramps. Muscle & Nerve, 2016
- NHS · Foot pain
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.