Is pain when standing a symptom of sciatica?

Maybe...: Sciatica is an old medical term for irritation of the sciatic nerve: pain from the buttocks down the back of the leg. But it's usually caused by irritation of the roots of this nerve in the spine. The problem causing this is different for each. Usually a herniated disc can irritate the nerve in various ways. Sometimes, standing up straight can shift the spine to cause this. The "pinched nerve".

It can be: This may be dependent on the size and location of a disc herniation in the lower back.

Spine Pain: This pain in the distribution as you suggested is the result of an irritated nerve or facet joints or other injury typically in the lumbar spine (low back) which are caused by herniated disks, spinal stenosis or degenerative disc disease, etc requiring further evaluation by a spine specialist.