Leg Cramps During Pregnancy: Night Relief and When to Call

Leg cramps during pregnancy are common and usually harmless. They tend to arrive at night, in the second half of pregnancy, when a calf muscle suddenly locks tight and hurts. When one hits, stretch the calf: pull your toes up toward you with your knee straight, or stand up and put your weight on that leg. Then rub the muscle or put warmth on it. Nobody knows exactly what causes them, and they should stop after the birth. The one to call about is different: pain that doesn’t let go, or a calf that is swollen, warm or red.

Where this post stops

I’m not a doctor or a midwife. I’m pregnant with my second, and this is the “is this normal-ish?” version, built from health-body pages I read in October 2026. If anything in the “when to call” section fits, skip the rest and call.

What a pregnancy leg cramp is

The NHS’s leg cramps page describes a muscle in the leg that “tightens and causes a sudden pain that can make it hard to move”. It’s usually the calf, sometimes the foot, less often the thigh. A cramp “can last from a few seconds to 10 minutes”, and the muscle “might feel sore for up to 24 hours” afterwards. Cramps can come at any time, “but most people have them at night or when resting.”

Pregnancy makes them more likely. Northern Ireland’s health service, nidirect, says “about a third of pregnant women have leg cramps, usually during the last trimester of pregnancy (week 27 to the birth)”. Ireland’s HSE, on its leg cramps in pregnancy page, says they’re common “particularly in the second trimester and third trimester”.

Nobody knows the cause. HealthLinkBC says “doctors don’t know exactly what causes leg cramps during pregnancy.” HSE says “there is no specific cause” and suggests changes to your blood and circulation, and tired leg muscles. So be skeptical of any page that confidently blames one thing and then sells you the fix. The good news: nidirect says they “should pass after the baby is born.”

How to stop one when the bump is in the way

The standard advice is to reach down and pull your toes toward you. In the third trimester the bump is between you and your foot, so here’s the same advice in an order that still works.

1. Straighten the leg and flex the foot. HSE says to “gently pull your toes upwards”, and that “you will get a better stretch if your knee is straight.” You don’t have to reach your toes: push your heel away and pull the top of your foot back toward your shin.
2. Stand on it. The NHS says “standing up and putting your weight on the leg with the cramp may also help.” With a bump this is often the easiest option: roll to your side, sit up, swing your legs over and stand, holding the bedside table if you need to.
3. Hand the job over. If someone sleeps next to you, they can do the toe pull. Agree on it before the first cramp, so they aren’t half-asleep and guessing.
4. Rub it out. HSE says to “rub the muscle hard”. The NHS adds that “most cramps go away without you doing anything.”
5. Add warmth. HealthLinkBC suggests you “place a heating pad or warm water bottle on your leg.” A pad with an automatic shut-off, like the Sunbeam XL heating pad, suits the middle of the night. Still, switch it off before you drift back to sleep.

One rule overrides all five. They’re for a calf that clenches and then lets go. If your calf is swollen, warm or red, don’t treat it as a cramp to rub out. Go straight to the section on when to call.

The before-bed routine that may cut them down

HSE says plainly “you cannot completely prevent leg cramps in pregnancy.” But a few habits come up across the pages I read.

• Stretch your calves before bed. The NHS stretch: face a wall with your arms out and your feet flat, lean in until you feel your calves stretch, and hold for 2 or 3 seconds. Repeat for 5 minutes, three times a day, “the last time just before bed”. The NHS says it “may help to reduce cramps but may not completely stop them from happening.”
• A warm bath before bed. It’s on HealthLinkBC’s list, alongside regular exercise.
• Stay active in the day. HSE’s list includes staying active, drinking enough water, and comfortable, supportive shoes. If your job keeps you standing, on your feet all day while pregnant covers shoes and rest breaks.
• Loosen the sheets. nidirect’s night-time advice includes “keep your sheets and blankets loose”, to keep your feet relaxed overnight.

If your OB or midwife has told you to limit activity, follow their advice over a general web page.

Setting up the bed so you can get to the leg fast

This is the side-sleeping setup you’ll want anyway, with one change for cramps: you need to get from lying on your side to standing quickly.

• Sleep on the side nearest the edge of the bed, so standing is one move, not a crawl over pillows.
• Keep the pillow between your knees easy to kick away. The full system is in how to sleep when pregnant, and Betteroo has a step-by-step on where each section goes if you’re setting one up for the first time.

Awake at 3am anyway? Plan the nights that come next Betteroo turns a two-minute quiz into a day-by-day newborn sleep plan that adjusts as your baby changes. Take it while you're still pregnant, and the plan is ready before the first night home. Take the 2-minute sleep quiz →

Cramp or restless legs?

A cramp is a muscle locking tight and hurting. Restless legs is an uncomfortable or strange feeling that eases when you move. The NCT’s page on sleep disruption in pregnancy says up to 1 in 4 pregnant women and people have it, that it is “most common at night”, and that it usually goes away after the birth. If that sounds more like you, bring it up at your next appointment.

When to call your OB or midwife

This is the part that matters. ACOG’s deep vein thrombosis FAQ lists “pregnancy and the 4 to 6 weeks after giving birth” as a risk factor for blood clots, and a clot in a leg vein (DVT) can be mistaken for a bad cramp.

Call your OB, midwife or maternity unit urgently, the same day, if:

• your leg is red and swollen (HSE)
• you have throbbing pain or swelling in one leg, usually the calf or thigh (the NHS DVT page)
• the skin around the painful area looks red, blue or darker, or the veins look swollen (NHS)
• the calf is warm or tender, or one leg hurts constantly when you stand or walk (ACOG)
• leg pain doesn’t go away, especially with swelling (HealthLinkBC)

Call 911 or go to the emergency room if you have leg pain or swelling and you also feel short of breath or have chest pain. ACOG lists both among the signs of a clot that has reached the lungs. The NHS says that “can be life-threatening and needs treatment straight away”, and that you shouldn’t drive yourself.

Mention it at your next visit, or call sooner, if:

• cramps keep waking you (the NHS’s first “see a GP” reason is cramps “disturbing your sleep”)
• you also have numbness or swelling in your legs
• a cramp lasts longer than 10 minutes and doesn’t ease when you stretch (nidirect)

Any treatment beyond stretching is your provider’s call, not a blog’s. For next-day soreness, ask your OB or pharmacist what’s safe for you.

FAQ: leg cramps during pregnancy

When do leg cramps start in pregnancy?

HSE says they’re common in the second and third trimesters. nidirect puts most in the last trimester, from week 27. More on the last stretch is in third trimester comfort.

Are leg cramps a sign something is wrong with the baby?

No source I read links ordinary leg cramps to the baby’s health. Watch your own leg instead: a swollen, red, warm or constantly painful calf is a call.

Will they go away after the birth?

nidirect says they “should pass after the baby is born.” The nights won’t suddenly get quiet, though. Betteroo builds a newborn sleep plan from a short quiz, for about $20 a month, so you can do that planning now. It’s a planning tool, not medical advice.