Help plz. i have over 1,5month upper left buttock pain constant. when i took antifl is better but when i stop therapy again same pain there. went to orthop doc did xray said that i have disc problem like sciatica. but i worry. can it be cancer?

Unless you have CT scan/ MRI, the diagnosis of herniated disc with sciatica can only be suspected by examination. A plain X ray of the spine cannot detect herniated disc. Your problem could be due to radiculopathy or sacroiliitis, improved with anti-inflammatory drug, very less likely due to a malignant disease. Family doctor should order some basic blood tests for r/o common rheumatic disorders.

Not uncommon problem and the pain generator needs to be confirmed. As mentioned, a plain X-ray shows very little, and is unlikely to uncover diagnosis. Might consult with physical therapist and get stabilizing intervention with exercises and stretching. If a "disc" problem, there may be desiccation and shrinkage over several months. Doesn't appear that surgery is indicated.