Cramping that lasts a full week usually points to something beyond a normal menstrual period or a passing stomach bug. The cause could be as straightforward as ovulation pain that lingered, early pregnancy, or a strained abdominal muscle. It could also signal a condition that needs attention, like endometriosis, irritable bowel syndrome, or an infection. The key to narrowing it down is paying attention to where you feel the cramping, what makes it better or worse, and whether you have any other symptoms alongside it.
Early Pregnancy
If there’s any chance you could be pregnant, that’s worth ruling out first. Around six to twelve days after ovulation, a fertilized egg implants in the uterine lining, and some people feel cramping during this process. Implantation cramps tend to feel different from period cramps. They’re often described as a prickling, pulling, or tingling sensation rather than the deep, heavy ache of menstruation. They’re also generally mild and settle in the lower abdomen, sometimes favoring one side.
For most people, implantation cramping lasts one to three days. But the early weeks of pregnancy can bring continued mild cramping as the uterus begins expanding. If a week of cramping coincides with a missed or late period, a home pregnancy test is the fastest way to get clarity. Severe one-sided pain with dizziness or shoulder pain is a different situation entirely and could indicate an ectopic pregnancy, which needs immediate medical care.
Endometriosis and Uterine Fibroids
Normal period cramps are tolerable and shouldn’t force you to miss work, school, or daily activities. When cramping stretches well beyond the first couple days of your period, intensifies over months or years, or starts before bleeding and persists days into it, endometriosis is one of the more common explanations. Endometriosis happens when tissue similar to the uterine lining grows in places it shouldn’t, like on the ovaries, fallopian tubes, or pelvic walls. The hallmark is pelvic pain that’s far worse than typical menstrual cramping, and it tends to get worse over time rather than staying stable cycle to cycle.
Uterine fibroids (noncancerous growths in the uterus) and adenomyosis (where uterine lining tissue grows into the muscular wall of the uterus) can produce similar prolonged cramping. Fibroids often add heavy or prolonged bleeding to the picture, while adenomyosis tends to cause a deep, constant ache alongside heavier periods. If your week of cramping seems tied to your cycle but far exceeds what you’ve experienced before, these conditions are worth investigating with your doctor.
Ovulation Pain
Ovulation pain, sometimes called mittelschmerz, hits roughly 14 days before your next period. It typically lasts a few minutes to a few hours, though it can occasionally stretch to a day or two. It won’t last a full week, so if your cramping started mid-cycle but has persisted for seven days, ovulation alone doesn’t explain it. Pain at any other point in your cycle isn’t ovulation pain. Persistent pelvic pain that began around ovulation but kept going could suggest a ruptured ovarian cyst, which sometimes causes sharper pain on one side followed by days of dull aching as fluid irritates surrounding tissue.
Irritable Bowel Syndrome
Not all cramping originates in the reproductive system. IBS is one of the most common causes of ongoing abdominal cramps, and it’s easy to mistake for gynecological pain because it often settles in the lower belly. The defining feature of IBS cramping is its relationship to bowel movements. The pain usually flares before or during a bowel movement and eases afterward. You might also notice bloating, gas, or changes in stool consistency.
IBS involves stronger-than-normal contractions of the intestinal muscles. Instead of the smooth, coordinated waves that move food through your gut, the muscles spasm, producing cramps that can range from mild to severe. These spasms can persist for days or weeks, especially during periods of stress, dietary changes, or hormonal shifts. IBS is a long-term condition, so if your cramping follows this pattern and has happened before, that history is a useful clue.
Inflammatory Bowel Disease
Inflammatory bowel disease is a different condition from IBS, despite the similar name. IBD involves chronic inflammation in the digestive tract and includes Crohn’s disease and ulcerative colitis. With Crohn’s, cramping typically settles in the right lower or middle abdomen and can range from mild to severe. Ulcerative colitis tends to cause cramps in the lower left side. Both conditions often come with diarrhea (sometimes bloody), fatigue, and unintentional weight loss. If your week of cramping includes any of those symptoms, IBD is a possibility that benefits from early evaluation.
Pelvic Inflammatory Disease
PID is an infection of the reproductive organs, usually caused by sexually transmitted bacteria that travel upward from the cervix. It can cause persistent lower abdominal pain that builds over days. Alongside the cramping, you might notice fever, unusual vaginal discharge with a bad odor, pain during sex, burning when you urinate, or bleeding between periods. Some people with PID have very subtle symptoms, though, so it’s possible to have it with just the cramping and one or two other signs.
PID matters because untreated infection can scar the fallopian tubes, leading to chronic pelvic pain, ectopic pregnancy, or difficulty getting pregnant later. If your cramping started after unprotected sex or a new partner and comes with any of the symptoms above, getting tested sooner rather than later makes a real difference in outcomes.
Muscle Strain and Abdominal Wall Pain
Sometimes what feels like internal cramping is actually coming from the abdominal wall itself. A pulled or strained muscle from exercise, heavy lifting, or even prolonged coughing can cause pain that mimics organ-related cramping. The giveaway is that abdominal wall pain tends to be localized to one small, tender spot rather than spread across your lower belly. It also tends to stay the same or get worse when you tense your core muscles (like when sitting up from a lying position), whereas pain from your organs usually doesn’t change with muscle tension. This type of pain can linger for a week or more, especially if you keep re-aggravating the muscle.
What Doctors Look For
If you seek care for cramping that’s lasted a week, expect a conversation about the location, timing, and character of the pain, plus any accompanying symptoms like changes in your period, bowel habits, discharge, or fever. From there, the workup depends on where the pain seems to be coming from. For suspected gynecological causes, a pelvic ultrasound is typically the first imaging step. Gastrointestinal concerns might prompt blood work, stool tests, or eventually a colonoscopy. Urinary symptoms usually start with a urine analysis and culture. In some cases, more advanced imaging like an MRI or a procedure called laparoscopy (a small camera inserted through a tiny incision) is needed to find conditions like endometriosis that don’t always show up on ultrasound.
Signs You Shouldn’t Wait
A week of mild cramping that you can function through is worth monitoring and bringing up at a doctor’s visit. But certain combinations of symptoms warrant more urgency. Seek immediate care if the pain is severe enough to disrupt your ability to function, if you’re vomiting and can’t keep liquids down, if you have a fever alongside the cramping, if you notice severe constipation with worsening pain, or if the pain feels similar to something you’ve experienced before but noticeably more intense this time. Pain that is sharp, sudden, and localized to one side of your pelvis, especially with dizziness or shoulder pain, needs emergency evaluation to rule out an ectopic pregnancy or ovarian torsion.