How can I tell an endometriosis flare from med side effects?

A flare tends to follow a pattern—often cycling with your period/ovulation or showing up with the same triggers—and it usually feels like your “usual” symptom set (pelvic pain, cramps, bowel/bladder irritation, pain with sex, fatigue) ramping up and down. Medication side effects more often begin soon after starting a new drug, changing the dose, or adding another medication, and they can feel different from your baseline (for example: new nausea, dizziness, headaches, sleep changes, mood shifts, hot flashes, or brain fog). With estrogen-suppressing medications in particular, side effects can resemble menopausal symptoms, while a flare is more likely to feel like inflammation/irritation in the pelvis that you recognize from past cycles.

The most practical way to separate the two is pattern tracking: write down the day you started or changed a medication, your cycle day, and what symptoms changed (new vs. familiar, constant vs. cyclical, improving vs. escalating). Because endometriosis pain can also involve nervous-system sensitization over time, you can have real pain even when bleeding is suppressed—so “no period” doesn’t always mean “no flare.” If you’re unsure, our team can review your symptom timeline and medication history with you and help you map out whether what you’re feeling fits a medication effect, a pain flare pattern, or both—and what that means for a next-step plan.