I'm sorry to hear about the pain you're experiencing. Pain that extends from the shoulder down to the leg on one side and worsens before your periods but improves afterward can be quite distressing, especially when imaging and evaluations show no abnormalities.

Given that scans of the uterus, MRI, orthopedic, and neurological assessments are normal, and considering the timing of your pain in relation to your menstrual cycle, this pattern suggests a possible hormonal or musculoskeletal influence linked to your menstrual cycle. Conditions such as cyclic musculoskeletal pain or referred pain related to hormonal changes during the menstrual cycle might be involved. Sometimes, hormonal fluctuations can cause muscle or nerve sensitivity without visible structural changes on imaging.

Another possibility is endometriosis, which can cause cyclical pain, although it often shows on imaging; however, early or mild cases might not be detected easily. Since you mentioned no abnormalities on scans, this might be less likely but still worth considering.

It is also important to consider pelvic nerve irritation or entrapment that can cause radiating pain without clear imaging findings.

Given the complexity and persistence of your symptoms, I recommend consulting a gynecologist who specializes in menstrual-related pain and possibly a pain specialist or neurologist for further evaluation. They may consider additional diagnostic approaches or therapeutic trials to better understand and manage your pain.

If you experience worsening symptoms, new neurological signs, or severe pain, please seek immediate medical attention.

Take care, and I hope you find relief soon.To narrow down potential causes, we will need some more information.I understand you're having right-sided pain from your shoulder to your leg that gets worse before your period and better after. To better understand the situation, could you please share your age and gender?