Symptom
Leg Cramps & Night Cramps
Leg cramps that strike at night or after a day on your feet have many possible causes, but when they come alongside heavy, aching, or visibly veiny legs, an often-overlooked culprit is venous reflux. Pooled blood and raised pressure in the lower leg can trigger the calf muscle to seize.
Medically reviewed by Dr. Roger Eduardo, MD, FASMBS, Board-Certified General Surgeon. Last reviewed August 2026.
Book a consultation →Understanding Leg Cramps & Night Cramps
Nocturnal leg cramps are extremely common and usually harmless. Dehydration, low electrolytes, certain medications, long periods of standing, pregnancy, and normal aging all contribute. Because so many things cause them, cramps alone do not diagnose a vein problem.
What raises the suspicion of veins is the company they keep: cramps together with leg heaviness, day's-end swelling, restless legs, or visible varicose veins. In that pattern, a duplex ultrasound can show whether failing vein valves are part of the picture. When reflux is confirmed and treated, many patients find the cramps and the heaviness ease together. When the cause is not venous, we help point you toward the right care.
Symptoms
What it can feel like
- ◆Sudden, painful tightening of the calf, often at night.
- ◆Cramps after long periods of standing or sitting.
- ◆Frequently paired with heavy, aching legs or restless legs.
- ◆Sometimes alongside visible varicose veins or ankle swelling.
Causes
What drives it
- ◆Venous reflux and chronic venous insufficiency (an under-recognized contributor).
- ◆Dehydration or low electrolytes (potassium, magnesium, calcium).
- ◆Medications such as some diuretics and cholesterol drugs.
- ◆Prolonged standing, pregnancy, and normal aging.
When to seek care
A cramp that comes with swelling, warmth, or redness in one leg can signal a blood clot and needs urgent evaluation. Frequent, disruptive cramps, especially with leg heaviness, swelling, or visible veins, are worth a vein evaluation to see whether venous reflux is a factor.
How we treat Leg Cramps & Night Cramps
Care begins with the right diagnosis, then a plan matched to you by one physician who follows you through it.
Venous reflux evaluation
Ultrasound determines whether vein valve failure is contributing to the cramps.
Learn more →Radiofrequency ablation
Closing the refluxing vein can relieve the cramping and heaviness it drives.
Learn more →VenaSeal
A no-compression closure option for the source vein.
Learn more →Condition FAQ
Leg Cramps & Night Cramps: common questions
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They can contribute. Venous reflux raises pressure in the lower leg, and that is an under-recognized trigger for nocturnal calf cramps, especially when they come with leg heaviness, swelling, or visible veins. Cramps alone are not diagnostic, but in that pattern a vein evaluation is reasonable.
A cramp with swelling, warmth, or redness in one leg can indicate a blood clot (DVT) and should be evaluated urgently. Occasional isolated cramps are usually harmless.
When venous reflux is a driver, closing the failing vein often reduces the cramps along with the aching and heaviness. If the cramps are not venous in origin, treatment will not resolve them, and we help direct you to the right care.
Start your journey
Concerned about leg cramps & night cramps?
Book a consultation with Dr. Eduardo for a clear diagnosis and a plan matched to you.
