A muscle cramp is a strong, painful contraction or tightening of a muscle that comes on suddenly and lasts from a few seconds to several minutes. It often occurs in the legs. A muscle cramp is also called a charley horse.
Nighttime leg cramps are usually sudden spasms, or tightening, of muscles in
the calf. The muscle cramps can sometimes happen in the thigh or the foot.
They often occur just as you are falling asleep or waking up.
What causes muscle cramps?
The cause of muscle cramps isn't always known. Muscle cramps may be brought on by many conditions or activities, such as:
Exercising, injury, or overuse of muscles.
Pregnancy. Cramps may occur because of decreased amounts of minerals, such as calcium and magnesium, especially in the later months of pregnancy.
Exposure to cold temperatures, especially to cold water.
Other medical conditions, such as blood flow problems (peripheral arterial disease), kidney disease, thyroid disease, and multiple sclerosis.
Standing on a hard surface for a long time, sitting for a long time, or
putting your legs in awkward positions while you sleep.
Not having enough potassium, calcium, and other minerals in your
dehydrated, which means that your body has lost too much
You may need to try several different ways to
stop a muscle cramp before you find what works best for you. Here are some things
you can try:
Stretch and massage the muscle.
Take a warm shower or bath to relax the muscle. A heating pad placed on the muscle can also help.
Try using an ice or cold pack. Always keep a cloth between your skin and the ice pack.
Take an over-the-counter pain medicine, such as acetaminophen (Tylenol), ibuprofen (Advil, Motrin), or naproxen (Aleve). Read and follow all instructions on the label.
If your doctor prescribes medicines for muscle cramps, take them exactly as prescribed. Call your doctor if you have any problems with your medicine.
Drink plenty of fluids. Sports drinks, such as Gatorade, will often help leg cramps.
Here are some things
you can try for a leg cramp:
Walk around, or jiggle your leg.
Stretch your calf muscles. You can do this stretch while you sit
While sitting, straighten your leg and flex your foot up
toward your knee. It may help to place a rolled towel under the ball of your
foot and, while holding the towel at both ends, gently pull the towel toward
you while keeping your knee straight.
While standing about
2 ft (0.6 m) from a wall, lean
forward against the wall. Keep the knee of the affected leg straight and the
heel on the ground. Do this while you bend the knee of the other leg. See a
picture of how to do this
If you think a medicine is causing muscle cramps:
Before you take another dose, call the doctor who prescribed the medicine. The medicine may need to be stopped or changed, or the dose may need to be adjusted.
If you are taking any medicine not prescribed by a doctor, stop taking it. Talk to your doctor if you think you need to continue taking the medicine.
How can you prevent muscle cramps?
These tips may help prevent
Drink plenty of water and other fluids, enough so that your urine is light yellow or clear like water.
Limit or avoid drinks with alcohol or caffeine. These can make
you dehydrated, which means your body has lost too much fluid.
Make sure you are eating healthy foods (especially if you are
pregnant) that are rich in calcium, potassium, and magnesium.
Ride a bike or stationary bike to condition and stretch your
Stretch your muscles every day, especially before and after exercise and at bedtime.
Don't suddenly increase the amount of exercise you get. Increase your exercise a little each week.
Take a daily multivitamin supplement.
If you are taking medicines that are known to cause leg
cramps, your doctor may prescribe different medicines.
What if muscle cramps keep coming back?
Talk with your doctor if you have muscle
cramps that keep coming back or are severe. These may be symptoms of another problem, such as restless legs syndrome.
If cramps keep coming back, bother you a lot, or interfere with your sleep, your doctor may prescribe medicine that relaxes your muscles.
Other Places To Get Help
American Academy of Orthopaedic Surgeons
6300 North River Road
Rosemont, IL 60018-4262
The American Academy of Orthopaedic Surgeons (AAOS)
provides information and education to raise the public's awareness of
musculoskeletal conditions, with an emphasis on preventive measures. The AAOS
website contains information on orthopedic conditions and treatments, injury
prevention, and wellness and exercise.
American Academy of Neurology (2010). AAN summary of evidence-based guideline for clinicians: Symptomatic treatment for muscle cramps. Available online: http://www.aan.com/practice/guideline/uploads/394.pdf.
American Academy of Neurology (2010). AAN summary of evidence-based guideline for patients and their families: Drug treatments for symptoms of muscle cramps. Available online: http://www.aan.com/practice/guideline/uploads/395.pdf.
Katzberg HD, et al. (2010). Assessment: Symptomatic treatment for muscle cramps (an evidence-based review): Report of the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology. Neurology, 74(8): 691–696. Available online: http://www.neurology.org/cgi/content/full/74/8/691.
Young G (2009). Leg cramps, search date September 2008.
Online version of BMJ Clinical Evidence: http://www.clinicalevidence.com.
How this information was developed to help you make better health decisions.