The cause of PT may depend if you are young or old.
PT is noticed in 4% of those with tinnitus, but if can be as high as 10% where more than half think it's non PT.
For the young it's often arteriovenous malformation relating to sinus problems.
For the old it's often arteriosclerosis. Buildup of plaque or cholesterol - hardening of the arteries. Included may be a injured leg(s) where veins/arteries have low blood pressure. If the leg is involved then the thigh will get sore. Leg(s) or feet will swell with lost of hair on top of feet. Feet will become red, but will turn white then being raised above heart level.
Exercise - walking and moving around as well as periods of raising the leg above heart level is needed.
Carotid arteries PT involvement will cause a constant headache and facial numbness. There's also 300 other possibilities that will cause a headache or facial numbness when having tinnitus.
Changes to the cerebral somatic regions that can include the jugular vein.
Blood work check - anemia, diabetes, sugar, fat, protein, infection, thyroid, vitamins, iron, and cholesterol.
Recently I posted a chart of which radiological tests are needed per possible condition(s).