Endometriosis is most commonly linked with pelvic pain and painful periods. Endometriosis pain often peaks during  — and just before — your period. But it can also flare up around ovulation and linger throughout the cycle because of hormonal changes and inflammation, says Dr. Jones. Keeping track of your symptoms using an app like Flo can help you spot what’s usual for you throughout your cycle — and give you the information you need to have a confident conversation with your doctor about your health.