Doctors donât know exactly what causes migraines. It appears that migraine headaches may be caused in part by changes in the level of a body chemical called serotonin. Serotonin plays many roles in the body, and it can have an effect on the blood vessels. When serotonin levels are high, blood vessels constrict (shrink).
Average Salary. The average annual salary for physical therapist in the United States is $86,520, which is 103% higher than the average income of Americans. The median pay for PTs is $7,210 per month, $1,663 per week and $41.59 per hour.
What they found was that across the board, physical therapy was the less costly approach. Initial referral for physical therapy cost $504 on average (for an average 3.8 visits), compared with an average of $1,306 for magnetic resonance imaging (the technology used in almost all of the imaging, according to authors).ven more dramatically, average subsequent costs over the next year were over 66% lower for the patients who began with a physical therapy referral--$1,871, compared with $6,664 charged to the imaging group over the same time period.