Mild cramping in early pregnancy is common. See a doctor if it is severe or comes with bleeding.
Why
Cramping in the first weeks comes from implantation and the uterus stretching.
Normal
Mild cramps like period pain are common.
Warning signs
Severe pain, bleeding, dizziness, shoulder pain, fever or pain on one side.
Ectopic pregnancy
Occurs in about 1 in 50 pregnancies.
What helps
Rest, a warm bath and a heating pad on low.
See a doctor
Right away for warning signs.
Early pregnancy cramp causes
Mild cramps early in pregnancy can arise from implantation, uterine growth, hormone changes, constipation and gas. The uterus begins to expand in the first weeks, and ligaments around it stretch, causing pulling sensations. Cramping that feels like a mild period is common in the first trimester.
- Roughly 1 in 4 women have light bleeding or spotting early on.
- Miscarriage occurs in about 10 to 20 percent of known pregnancies, mostly in the first trimester, and causes cramping with bleeding.
- Ectopic pregnancy affects about 1 in 50 pregnancies and may cause sharp one-sided pain, shoulder pain and dizziness.
What helps and when to call
Rest, warm baths (not hot), hydration and fiber for constipation can ease mild cramps. Acetaminophen is generally considered safe when used as directed, but check with a provider. Call the provider for cramps that are severe, persistent or paired with bleeding, fever, or foul discharge. Seek emergency care for sudden severe pain, heavy bleeding, fainting or shoulder tip pain.
Early pregnancy cramp causes
Mild cramps in early pregnancy occur as the uterus stretches and the embryo implants. Constipation and gas add to discomfort. Cramps similar to period cramps affect many women in the first trimester.
What helps and when to call
Rest, warm baths and hydration help. Call a provider for severe pain, bleeding, fever, dizziness or one sided pain, which could signal ectopic pregnancy or miscarriage. About 10 to 20 percent of known pregnancies end in miscarriage.
Why uterine cramps happen
Early cramping reflects uterine growth, implantation, increased blood flow, round ligament stretching and constipation from high progesterone. In the first trimester, the uterus grows from the size of a fist to about the size of a grapefruit by 12 weeks.
Distinguishing normal from worrying
Normal cramps are mild, intermittent and settle with rest. Warning features include pain that is severe, one sided or persistent, bleeding with clots, fever or fainting. Ectopic pregnancy occurs in 1 to 2 percent of pregnancies, usually between weeks 5 and 9. Urinary infections cause pain with urination. Contact a provider for any doubt.
Based on data from the American College of Obstetricians and Gynecologists and the NHS
