1,what are the symptoms of high blood pressure?
Mostly ,high blood pressure have no symptoms,someone doesn't know he have gotten hypertension till he stroke.Someone find out through being checked regularly ,so you should often accept examination .Common symptoms include headache ,dizziness ,nausea ,vomit ,fatigue ,heart throb,heart attack ......

2,what causes high blood pressure?
For most people with hypertension ,no single cause is know .We call
this type "essential "or "primary "hypertension .However we do know that over weight or obese persons or people who have a high salt intake in their diet have an increased chance of getting hypertension .The primary hypertension can not be cured ,but in most cases it can be controlled .
In a few people ,hypertension is cause by a known cause like chronic kidney disease ,adrenal gland tumor,narrow of kidney arteries ,or pregnancy .Wa call this type "secondary "hypertension "which can be cured if its cause is found and corrected . So when you find out your blood pressure is high ,you shoud consult with your doctor .
Other possible sources: hereditary , lifestyle and environment,stress ,depression......

3,can high cholesterol be a cause of high blood pressure?
In close relation. But lot of people with high cholesterolemia would not get hypertension all life .

4,does a symptom consist of swelling in the hands and eyes?
Not common ,unless there is other subsequent disease .