There is one brain parasite that has been shown to cause the heart to work harder due to parasitic Larvae occluding blood flow to the brain.
So to answer you question. Depending on where it is it can cause certain
organs to malfunction thereby compensating and raising the blood pressure.
This may be helpful to help you understand challenge and cause
http://www.cdc.gov/ncidod/dpd/parasites/cysticercosis/factsht_cysticercosis.htm
This also explains what happens in laymans terms - very insightful
http://eands.caltech.edu/articles/LXVI4/brainworms.html
You can also look at http://how-canihelp.com that talks about hypertension extensively.
Hope that helps
hypertension
Hypertension can cause damage to your heart, blood vessels, kidneys, eyes and brain
Primary Hypertension is the cause of unknown This is WRONG! I took a test and I used this answer and I got it wrong.
It can cause a variety of health problems such as Hypertension, Heart attack, sclerosis of the liver, and oral cancer.
Atherosclerosis can cause hypertension because it narrows the blood vessels (similar to vasoconstriction). Vasoconstriction can cause hypertension because it increases pressure and force in the vessels.
The main cause of heart disease in the United States is hypertension. Additional common causes of heart disease include both high cholesterol and diabetes.
Heart worms do cause congestion. However, if this has occurred, it may be too late for the host of these parasites.
Caffeine can cause hypertension and hypertension can cause other complications that may kill a person.
Hypertension can damage your body in many ways and, left uncontrolled, you can most certainly have a fatal heart attack.
It's possible, parasites can probably cause heart attacks. It might be a seizure from a neurological parasite too.
It can cause obesity which leads to many health complications like heart diseases and hypertension.
There are five different types of pulmonary hypertension including artery, venous, hypoxic, thromboembolic and miscellaneous. This disease can cause heart failure so it is very serious.