Nightly leg cramps (often called “charley horses”) are sudden, painful muscle contractions—usually in the calf, foot, or thigh—that can wake you from sleep. They are common, especially as people get older, but repeated cramps may have several possible causes.
Why nighttime leg cramps happen
- Muscle fatigue or overuse
- Long periods of standing, walking, exercise, or unusual activity can strain muscles.
- Dehydration
- Not drinking enough fluids may contribute to muscle tightness and cramping.
- Mineral or nutrient imbalances
- Low levels of certain minerals, such as magnesium, potassium, or calcium, can sometimes be linked with cramps, though supplements only help when a deficiency exists.
- Poor circulation or nerve issues
- Conditions affecting blood vessels or nerves (including diabetes-related nerve damage) may contribute to leg discomfort.
- Medications
- Some medicines, including certain diuretics and cholesterol medications, may be associated with muscle cramps in some people.
- Changes related to aging
- Muscles and tendons can become less flexible over time, increasing the likelihood of cramps.
What may help stop a cramp when it happens
- Gently stretch the cramped muscle (for a calf cramp, straighten the leg and pull the toes toward you).
- Massage the area.
- Apply a warm compress or take a warm shower.
- Walk around gently if you can.
Ways to reduce future cramps
- Stay adequately hydrated.
- Stretch calf and leg muscles before bedtime.
- Wear supportive footwear during the day.
- Keep regular, moderate physical activity.
- Review medications and health conditions with a healthcare professional if cramps are frequent.
See a healthcare professional if:
- Cramps happen often, are severe, or are getting worse
- There is swelling, redness, weakness, numbness, or skin color changes
- The pain is only in one leg and does not improve
- Cramps started after a new medication
If you’re experiencing these, it helps to know: Are the cramps in your calves, feet, or thighs—and do they happen every night or only occasionally?
