Bloating

Abdominal bloating is the feeling of fullness, pressure, or tightness in the abdomen, sometimes with visible swelling/distension that can change hour to hour. Many people with endometriosis describe a very specific pattern often called “endo belly,” where the abdomen becomes noticeably larger, tender, or firm—sometimes enough to affect clothing fit, posture, and comfort.

In endometriosis, bloating can be driven by inflammation, irritation of the bowel and pelvic lining (peritoneum), adhesions (scar-like bands), and pelvic floor muscle guarding. If endometriosis involves the bowel or sits near it, the digestive tract may become more reactive—leading to gas, constipation/diarrhea swings, and distension that worsens around ovulation or just before/through a period.

In adenomyosis, bloating can overlap with endo symptoms, but may also reflect uterine enlargement and congestion—especially in diffuse disease. Adenomyosis commonly causes heavy bleeding and cramping, and the pelvis can feel “full” or swollen, which may contribute to a bloated, pressure-heavy abdominal sensation.

Bloating from endometriosis/adenomyosis can resemble IBS, food intolerance, or typical premenstrual bloating—but it often stands out because it is severe, cyclical, associated with pelvic pain and fatigue, and may flare with sex, bowel movements, or prolonged sitting. It can also be unpredictable: you might wake up with a flat abdomen and look several months pregnant by late afternoon.

When bloating is persistent or disruptive, it deserves a deeper evaluation—especially when paired with pelvic pain, bowel/bladder symptoms, or heavy bleeding. A specialist assessment through our Evaluation & Diagnosis process can help determine whether symptoms fit endometriosis, adenomyosis, or a related condition listed in Related Conditions.

People describe endo-related bloating as more than “a little puffy.” It may feel like a tight balloon under the skin, a hard or swollen belly, or intense pressure that makes it uncomfortable to sit upright. Some notice tenderness to touch, soreness along the lower abdomen, or a pulling sensation—especially if adhesions are present.

For many, distension has a pattern: worse in the days leading up to a period, during menstruation, or around ovulation. Others have non-cyclical flares triggered by stress, lack of sleep, certain meals, constipation, or prolonged standing/sitting. It’s also common for bloating to travel with other symptoms—nausea, cramps, bowel urgency, or a “heavy pelvis” feeling.

The experience can vary widely. Some people mainly feel internal pressure without visible swelling; others have dramatic, sudden distension that changes within hours. If adenomyosis is part of the picture, bloating may feel more like pelvic heaviness and fullness, sometimes paired with worsening cramps and heavy bleeding.

Over time, untreated disease and repeated inflammation can lead to more frequent flares and a lower threshold for triggers. Many patients also develop a heightened sensitivity in the gut–pelvis connection, meaning smaller irritations can cause bigger sensations of distension.

Bloating and other GI symptoms are very common in people with endometriosis, which affects about 10% of women of reproductive age. Studies consistently show that many patients report abdominal bloating/distension at some point—often as part of a broader cluster including pelvic pain, constipation/diarrhea, and nausea.

Adenomyosis also frequently overlaps with GI-type symptoms, especially when it co-occurs with endometriosis (which is common). In adenomyosis, the strongest associations are with heavy bleeding and cramping, but many patients report abdominal pressure and bloating—particularly around menstruation.

Importantly, bloating does not reliably correlate with “stage” of endometriosis. Some people with minimal disease have significant bloating, while others with deep disease may have less. Symptom severity is influenced by lesion location (especially bowel/peritoneal involvement), inflammation level, nerve sensitization, and coexisting conditions such as IBS or pelvic floor dysfunction.

In endometriosis, the core driver is inflammation: endometrial-like tissue outside the uterus can bleed and inflame surrounding structures, releasing inflammatory chemicals that irritate the bowel and pelvic lining. This can slow or disrupt normal gut movement, contributing to constipation, trapped gas, and distension. Adhesions may further restrict how the bowel and pelvic organs move, creating a sense of pulling, pressure, or “stuck” bloating.

When endometriosis affects the bowel directly (or sits near it), symptoms can intensify. The bowel may become more sensitive to normal stretching and gas, and pain can lead to muscle guarding and altered breathing mechanics—both of which can worsen visible distension.

In adenomyosis, endometrial tissue grows within the uterine muscle, which can cause the uterus to become boggy, thickened, and sometimes enlarged. That increased pelvic volume, along with uterine inflammation and congestion, can create a sensation of fullness and contribute to abdominal pressure and bloating—especially during the luteal phase and menstruation.

Nerve involvement also matters. Chronic pelvic inflammation can lead to central sensitization (the nervous system becoming “on high alert”), where normal digestive sensations feel amplified. Stress, poor sleep, and untreated pain can lower your threshold for bloating flares—one reason integrative, whole-person care can be so helpful.

Because “endo belly” can have multiple drivers (inflammation, bowel irritation, adhesions, pelvic floor dysfunction, adenomyosis), treatment works best when it’s personalized. The first step is a clear evaluation to understand whether bloating is most consistent with endometriosis, adenomyosis, bowel involvement, IBS overlap, or another condition. Our team focuses on root-cause assessment through Evaluation & Diagnosis.

Medical options may reduce bloating when it’s tied to hormonal cycling and inflammation. Hormonal suppression can reduce endometriosis activity and period-related flares for some patients; learn more in Hormonal Therapy. Symptom-focused plans may also include evidence-based approaches to pain and inflammation (see Pain Management), plus targeted constipation/diarrhea support when appropriate.

Surgery can be an important option when bloating is driven by endometriosis lesions, adhesions, or deep disease affecting pelvic organs. For endometriosis, excision surgery (removing disease at the root) is considered the gold standard and may improve pain and GI symptoms for many patients—especially when disease is properly mapped and treated. Explore what this involves in Surgery & Advanced Excision and learn about our surgical expertise with Dr. Steven Vasilev. For adenomyosis, treatment may include medical management, uterus-sparing options in select cases, or hysterectomy depending on goals and severity (see adenomyosis).

Lifestyle and self-care strategies can help reduce day-to-day distension while you pursue diagnosis and definitive care. Many patients benefit from:

• Regular bowel habits (hydration, fiber adjustments individualized to tolerance)
• Gentle movement after meals and abdominal/diaphragmatic breathing to reduce guarding
• Identifying trigger foods (sometimes guided by a clinician; overly restrictive diets can backfire)
• Anti-inflammatory nutrition and gut-supportive strategies through Integrative Medicine & Lifestyle Care

Pelvic floor physical therapy can be surprisingly effective when bloating is worsened by muscle tension, constipation mechanics, or pain-related guarding. Complementary approaches (such as acupuncture, nervous system regulation, and targeted supplements) may also help some patients—especially when integrated with medical/surgical care rather than used as a substitute for diagnosis.

Seek urgent care immediately if bloating is accompanied by severe or worsening abdominal pain, fever, persistent vomiting, fainting, black or bloody stools, inability to pass stool or gas, sudden one-sided pelvic pain (possible ovarian torsion), or symptoms of significant anemia (chest pain, shortness of breath, severe dizziness). These can signal problems that require prompt evaluation beyond endometriosis/adenomyosis.

Schedule a specialist visit if bloating is frequent, painful, visibly distending, cyclical, or interfering with work, sleep, eating, or relationships—especially if you also have heavy bleeding, pelvic pain, painful sex, bowel or urinary symptoms, or infertility concerns. Because endometriosis can take 7–10 years to diagnose on average, earlier evaluation can shorten the time to effective treatment and reduce ongoing inflammation and sensitization.

When you talk with a clinician, bring specifics: when bloating occurs in your cycle, how quickly distension appears, bowel changes, foods that worsen it, and photos or measurements if helpful. If you’re ready for a thorough evaluation and a plan that addresses root causes, you can schedule a consultation with Lotus Endometriosis Institute.