Endometrial ablation is generally well tolerated, but it comes with a range of side effects, from mild recovery symptoms that clear up in days to rare but serious complications that can develop months or years later. Most people experience cramping, nausea, and vaginal discharge in the first few days. A smaller number face longer-term issues like trapped blood in the uterus, cyclic pelvic pain, or the eventual need for a hysterectomy.
Common Side Effects in the First Few Days
The most immediate side effects feel similar to a heavy period. You can expect cramps for one to three days after the procedure, though for some people they last longer. Nausea is common on the day of the procedure itself, and you may need to urinate more frequently during the first 24 hours.
A watery or bloody vaginal discharge is normal and can last for several weeks as the uterine lining heals. The discharge often starts out bloody and gradually becomes thinner and lighter before stopping. Some people also experience strong cramping or vomiting in the first few days, particularly if the procedure involved heat or electrical energy delivered to the uterine lining.
Infection Risk
Pelvic infection is an uncommon but real risk. A meta-analysis of ablation procedures found that endometritis (infection of the uterine lining) occurs in roughly 1.4 to 2.0% of cases. Pelvic inflammatory disease was reported in about 1.1% of cases, and pelvic abscess occurred in up to 1.1%. Deeper infection of the uterine muscle wall (myometritis) was rarer, at under 1%. Signs to watch for include worsening pain, fever, or foul-smelling discharge in the days and weeks following the procedure.
Surgical Complications
During the procedure itself, there is a small chance of damage to the uterus or surrounding structures. The Mayo Clinic lists three main surgical risks: a puncture injury to the uterine wall from instruments, heat or cold damage to nearby organs, and bleeding. These complications are rare, and most ablations are completed without incident, but they are the reason the procedure is performed in a clinical setting with monitoring.
Trapped Blood and Cyclic Pain
One of the more troublesome longer-term side effects is a condition called hematometra, where blood becomes trapped inside the uterus. This happens when the ablation scars over the lower part of the uterine cavity or cervical canal, creating a blockage. Residual or regenerating patches of uterine lining continue to bleed behind that scar tissue, and the blood has nowhere to go.
Hematometra affects an estimated 1 to 2% of people who undergo ablation. The hallmark symptom is cyclic cramping pain in the lower abdomen that shows up at the time you would normally expect a period, even though you may have no visible bleeding. This pain typically begins anywhere from two to fifteen months after surgery. Treatment usually requires a follow-up procedure to drain the trapped blood or, in persistent cases, a hysterectomy.
Post-Ablation Tubal Sterilization Syndrome
If you had your tubes tied before or at the same time as an ablation, you face an additional risk called post-ablation tubal sterilization syndrome, or PATSS. In this condition, small amounts of blood from residual endometrial tissue flow backward into the fallopian tubes. Because the tubes are sealed from the prior sterilization, the blood becomes trapped, causing the tubes to swell. The result is cyclic pelvic pain that can be severe enough to require surgery.
Long-Term Failure and Hysterectomy Rates
Ablation does not always provide a permanent solution to heavy bleeding. Over time, the uterine lining can partially regenerate, and symptoms may return. A large Canadian study tracking over 76,000 patients found that about 16.5% of women had a hysterectomy within five years of their ablation. By 15 years, nearly 29% had undergone one. These numbers don’t mean the ablation “failed” in every case; some hysterectomies were performed for new conditions. But they do reflect the reality that ablation is not always a one-and-done fix, particularly for younger patients whose uterine lining has more years to regrow.
If bleeding returns or worsens after an initial ablation, a repeat ablation is sometimes possible, though it carries higher complication rates because the uterine wall may be thinner from scarring. Hysterectomy is often the recommended next step if symptoms are significant.
Pregnancy Risks After Ablation
Ablation is not a form of birth control. Pregnancy is unlikely after the procedure, but it can still happen, and when it does the risks are serious. The American College of Obstetricians and Gynecologists warns that miscarriage and other complications are greatly increased in post-ablation pregnancies, because the damaged uterine lining cannot support a placenta normally. Anyone who might want to become pregnant in the future should not have this procedure. If you do have an ablation, reliable contraception is recommended until menopause. Some people choose sterilization at the same time as ablation to eliminate this risk entirely.
Who Faces Higher Risk of Side Effects
Certain conditions make ablation riskier or rule it out altogether. The procedure is not recommended for people who have uterine cancer or an elevated risk of it, an active pelvic infection, certain structural abnormalities of the uterus, or a desire for future pregnancy. It is also generally not performed after menopause. If any of these factors apply, the chance of complications rises and the potential benefit shrinks, which is why thorough evaluation before the procedure matters.