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The Calf Muscles  
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Definition  

Nocturnal leg cramps are sudden contractions of the lower leg and foot muscles. They often awaken you from sleep. The calf muscles are most often involved.

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Causes  

The specific cause of nocturnal leg cramps is unknown. These cramps may be related to imbalances in local muscle chemistry. This can be related to problems with nerves, muscles, or blood supply.

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Risk Factors  

Nocturnal leg cramps are more common in people aged 50 years and older. Other factors that may increase your chance of nocturnal leg cramps include:

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Symptoms  

The main symptom is sudden calf or foot cramps.

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Diagnosis  

You will be asked about your symptoms and medical history. A physical exam will be done.

Your bodily fluids may be tested. This can be done with blood tests.

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Treatment  

Talk with your doctor about the best plan for you. This may include treatment for any underlying causes of the nocturnal leg cramps.

If no specific cause can be found, treatment options include the following:

  • When cramps occur, stretch your leg muscles
  • Standing on the affected leg and walking often stops the cramping
  • Massage and hot or cold treatments help the muscles relax

Medications  

No medication has proven to treat nocturnal leg cramps. Quinine, while often effective for reducing the frequency and intensity of cramps, has a significant risk of major allergic reactions.

Other medications have may be used in severe cases. These may include:

  • Muscle relaxants
  • Calcium channel blockers
  • Anticonvulsants
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Prevention  

To help reduce your chance of nocturnal leg cramps:

  • Stretch during the day and just before going to bed
  • Exercise feet and legs regularly
  • Drink plenty of liquids
  • Wear comfortable, supportive shoes