A posture headache is muscle and joint-driven pain from neck strain, while a migraine is a neurological condition involving specific brain and nerve pathway changes, and the two respond to completely different things.
Sciatica is irritation of the sciatic nerve that causes pain, tingling, or numbness from the lower back or buttock down one leg, and sitting and standing each load that nerve in different ways.
Sciatica is irritation of the sciatic nerve that sends pain, tingling, or numbness from the lower back or buttock down one leg, and sitting makes it worse by compressing the nerve and the muscles around it.
