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.
Browse the map below to find out the average PTA salary by State; The average hourly wage of a Physical Therapist Assistant in the US is $26.56 per hour. Average range across all States: From a low of $35,000 in South Dakota to a high of $73,000 in Texas. This represents a variance of over 100% in earnings, even taking into consideration cost of living adjustments.