Nighttime leg cramps are common, especially in older adults, but the exact cause is often unclear. They are usually sudden, painful muscle contractions that most often affect the calf, foot, or thigh.
Common reasons for night cramps
- Muscle fatigue or overuse from exercise, standing for long periods, or unusual activity.
- Sitting or lying in one position for a long time, which can shorten muscles.
- Dehydration, particularly after heavy sweating or inadequate fluid intake.
- Pregnancy, especially during the second and third trimesters.
- Certain medications, such as some diuretics (“water pills”), statins, or other drugs in some people.
- Medical conditions, including diabetes, kidney disease, thyroid disorders, nerve problems, or poor circulation.
- Older age, as cramps become more common with aging.
What you can do
- Stretch your calf and hamstring muscles before bed.
- Stay well hydrated throughout the day.
- Wear supportive shoes if you’re on your feet a lot.
- Avoid suddenly increasing the intensity of exercise.
- If a cramp occurs:
- Gently straighten your leg.
- Pull your toes toward your shin.
- Massage the muscle.
- Apply a warm towel or heating pad if it helps.
Should you take magnesium?
Many people recommend magnesium, but research shows it does not consistently relieve nighttime leg cramps for most adults, unless you have a magnesium deficiency or are pregnant. It’s best not to start supplements without discussing them with a healthcare professional, especially if you have kidney disease.
