Leg Cramps at Night: Causes, Prevention & Treatment
Night leg cramps are sudden, involuntary tightening of a muscle, most often the calf. They can be extremely painful but are usually harmless and often last only a few seconds to 10 minutes. The muscle may remain sore afterward.
Common causes
Sometimes there is no clear cause. Factors associated with nighttime cramps include:
- Getting older
- Muscle fatigue or strenuous exercise
- Dehydration
- Pregnancy
- Sitting or being inactive for long periods
- Certain medicines, including some diuretics and statins
- Kidney disease or dialysis
- Diabetes-related nerve problems
- Problems with blood flow
- Certain thyroid, liver, or neurological conditions
It’s also worth knowing that restless legs syndrome is different from a leg cramp. Restless legs usually creates an urge to move the legs rather than a sudden, painful muscle contraction.
What to do during a cramp
If your calf suddenly cramps:
- Straighten the leg.
- Pull your toes upward toward your face to stretch the calf.
- Gently massage the cramped muscle.
- Try standing and putting weight on the affected leg if you’re able to do so safely.
- A warm shower or bath may help relax the muscle; some people also find cold massage helpful.
How to prevent nighttime cramps
- Do gentle calf stretches before bed.
- Stay adequately hydrated throughout the day.
- Avoid excessive alcohol and caffeine.
- Regular light activity may help.
- If you’ve recently increased exercise, increase the workload gradually.
- Review your medications with a doctor or pharmacist if cramps started after a medication change
