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.
Physical therapist salary in USA. A physical therapist receives an average hourly wage ranging from $24.73 to $35.40 per hour which can increase by $32.70 â $51.24 per hour overtime. An average yearly salary ranges for a physical therapist ranges from between $50,645 â $82,036 per annum.he lowest paid 10 percent of physical therapists earned less than $53,620, per year, whereas the top 10 percent of them received more than $107,920 per year,this makes physical therapist salary one of the highest among medical therapists. 1  Share on Facebook.