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.
Top-paid physical therapists can make over $53 per hour. You can earn over $53.21 per hour as a physical therapist if you are among the top 10 percent in earnings, according to May 2011 data from the Bureau of Labor Statistics.our average hourly earnings as a physical therapist would be $38.38, according to the BLS. This equates to $79,830 per year, which is just under the $80,000 salary the American Physical Therapy Association reports. Your hourly rate would likely fall in the $31.66 to $44.14 range, which is what the middle half earned.