Your pain might be caused by some disease of your backbone or something in lower abdomen area.
If it responses for ibuprofen
, most likely you are suffering from some inflammation process of your tail bone area. It can be inflammation of coccyx
caused by some injury
or overload, sciatic nerve irritation
(this pain most likely radiates to leg) or it can be pilonidal cyst. Any bone/muscles/spinal cord
disorders in this area including sciatic nerve irritation and coccyx disorder may be ruled out by MRI of this region.
Pilonidal cyst is mostly located at the cleavage between the buttocks. It appears when a hair grows under the skin in this place. It causes inflammation process in this place, and it creates a cyst. It can give no symptoms when no inflammation is present, but it can also be very painful when pus appears (this can be associated with fever and cold sweats). Diagnose is very simple, but you should visit surgeon to rule it out.
Hope this will help