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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. The cramps are harmless. They do not mean that you have a serious disease.

The Calf Muscles  
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Causes  

Although the specific cause is unknown, these cramps may be related to imbalances in local muscle chemistry. Many activities and diseases are associated with nocturnal leg cramps:

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Risk Factors  

The following factors increase your chance of developing nocturnal leg cramps:

  • Age over 50
  • Overexertion
  • Pregnancy
  • Staying in certain positions for a long time
  • Flat feet or other foot or ankle deformities
  • Alcoholism
  • Neurologic diseases
  • Certain medications
  • The diseases mentioned above
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Symptoms  
  • Sudden nighttime calf (or foot) cramps
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Diagnosis  

Your doctor will ask about your symptoms and medical history. A physical exam will be done.

Tests may include the following:

  • Blood tests—for hormone or chemical imbalances (most tests are normal)
  • Checking your foot pulses to assure good circulation
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Treatment  

Talk with your doctor about the best plan for you. If no specific cause can be found, treatment options include the following:

  • When cramps occur, pull against them with your leg muscles. Also, grab your foot (feet) and pull up.
  • Standing on the affected leg often stops the cramping.
  • Massage and hot or cold treatments will help the muscles relax.
Medications  

None of these medicines has earned full approval for either safety or efficacy. Quinine , while often effective to prevent cramps, has a significant risk of major allergic reactions. The other prescription medications carry risks as well. So they are not generally recommended. They are most often used in only severe cases.

Over-the-Counter  
Prescription  
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Prevention  

To reduce your chance of getting nocturnal leg cramps, take the following steps:

  • Stretch three times a day and just before going to bed.
    • Face a wall and put your hands on the wall and keep them there. Step backward. Keep your knees locked. Keep your heels on the floor until you feel a strong pull in your calves. Hold that position for 10 seconds. Repeat two or three times.
  • Exercise feet and legs regularly.
  • Drink plenty of liquids.
  • Eat plenty of potassium-rich foods. This includes bananas, tomatoes, potatoes, broccoli, cantaloupe, oranges, and grapefruit.
  • Wear comfortable, supportive shoes.
  • Sleep with toes up, not pointed downward.