Your sciatica should not sync with your cycle. If deep buttock pain shoots down the back of your thigh, into your calf, foot, or toes, and it predictably flares before or during your period, that timing is not random. It is a pattern. This is called catamenial sciatica, which means sciatic symptoms with a menstrual rhythm. One overlooked driver is endometriosis irritating or involving the sciatic nerve, sacral nerve roots, lumbosacral plexus, or nearby pelvic nerves. This is why so many women are dismissed. The leg pain is loud, so the case gets pushed into the musculoskeletal box: piriformis, disc, SI joint, glutes, hip flexors, core, posture. Sometimes those findings are real. Sometimes treatment helps. But then the next cycle comes, and the pain returns. Temporary relief does not prove the driver was purely mechanical. It proves the system can be modulated. In complex chronic pain, I do not only ask, “Where does it hurt?” I ask, “When does it hurt, what systems are involved, and what pattern keeps repeating?” My Cycle-Sciatica Mismatch Framework looks at 4 things: 1. Timing: does it flare before or during the period? 2. Territory: does it travel from buttock to thigh, calf, foot, or toes? 3. Neurology: tingling, numbness, weakness, foot slap, foot drop, or an unreliable leg? 4. Pelvic context: painful periods, bowel changes, bladder symptoms, pain with sex, fertility concerns, fatigue, or pelvic pain? This is not about self-diagnosis. It is about pattern recognition. A normal lumbar MRI does not rule this out. A normal pelvic ultrasound does not rule this out. If the pattern fits, ask whether you need an endometriosis specialist and pelvic MRI with an endometriosis protocol that evaluates the sciatic notch, sacral roots, and lumbosacral plexus. You are not dramatic for noticing the timing. You are not anxious for connecting the dots. You are not wrong for wanting the pattern taken seriously. Once the pattern is named clearly, the clinical conversation can change. I broke this down fully in this week’s Root Cause Breakdown on Substack, inside Movability Masterclass. Article: Catamenial Sciatica: When Sciatica Tracks With the Menstrual Cycle. Dr. Sina