Hello docs, is a brain mri common for headache sufferers?

Yes. It can rule out: Structural brain disorders and other conditions like multiple sclerosis, cerebrovascular disease, or a vascular malformation and even rheumatologic diseases that can harm the brain and cause migraine headaches. It can also help rule out central nervous system lyme's disease, mengiomas and malignancies. Best wishes.

Not uncommon, but: In well over 98% of all migraine patients, the MRI is totally normal and reassuring. I tend to do very few images these days in my migraine patients unless the neurological exam shows some suspicious abnormality raising concerns. Perhaps your doctor has similar concerns, discuss with your doctor.