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.
They found that physical therapy was the less costly approachâinitial 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 (MRI).lso, average subsequent costs over the next year were nearly 72% lower for patients who began with a physical therapy referralâ$1,871, compared with $6,664 for the imaging group over the same time period.