Common Causes
| Cause | Details |
|---|---|
| Dehydration | Reduced blood volume affects muscle function |
| Electrolyte imbalance | Low magnesium, potassium, or calcium |
| Medications | Statins, diuretics, some asthma medications |
| Pregnancy | Very common, especially 2nd-3rd trimester |
| Peripheral artery disease | Cramping with walking (claudication) — more serious |
| Kidney disease/dialysis | Common due to electrolyte disturbances |
| Overexertion | Prolonged or unusual exercise |
Blood Tests to Consider
| Test | Purpose |
|---|---|
| Magnesium | Common deficiency causing cramps |
| Potassium | Especially if on diuretics |
| Calcium | Deficiency or parathyroid issues |
| Kidney function (eGFR) | Chronic kidney disease |
| Thyroid (TSH) | Hypothyroidism associated with cramps |
Prevention Strategies
- Stay well hydrated, especially before exercise and bed
- Gentle calf stretches before bed
- Consider magnesium supplementation if levels are low
- Review medications with your doctor if cramps started after a new prescription
- Wear supportive footwear if standing for long periods
Cramping with Walking — Check CirculationIf leg pain/cramping occurs specifically with walking and eases with rest (intermittent claudication), this could indicate peripheral artery disease and should be assessed, particularly in smokers, diabetics, or those with known vascular disease.
Quick Relief During a CrampStretch the affected muscle immediately — for calf cramps, straighten the leg and pull the toes up towards the shin. Walking on the heel briefly can also help. Massaging the muscle assists relaxation.
Are leg cramps in pregnancy normal?
Yes, very common, especially in the 2nd and 3rd trimester, likely related to changes in circulation and mineral levels. Gentle stretching, staying hydrated, and magnesium supplements (if recommended by your midwife) can help.
Do quinine tablets help leg cramps?
Quinine was previously widely used but is now reserved for severe, frequent cramps due to rare but serious side effects (blood disorders). It's a prescription-only medication requiring monitoring.
Can statins cause leg cramps?
Yes — muscle aches and cramps are a recognised statin side effect. If troublesome, discuss with your doctor — a dose adjustment or switching statins may help.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.