Symptoms of hypertension?

Ususally none: Which is a huge part of the problem. In extreme cases patients will often note headache.

Renal Failure&stroke: Problem is you usually don't notice anything. If hypertension persists untreated it can lead to renal (kidney) failure, stroke, heart disease, peripheral vascular disease, etc. At the very least, you can get your blood pressure checked in many supermarkets or pharmacies at their automated blood pressure machines. Desirable results would be less than 120/80 mm hg.

None: Usually none; that's why it's a silent killer. If it is very severe it sometimes causes a headache, vision and neurological changes.

Wide range: Usually there are no symptoms. Every person's body reacts to elevated blood pressure differently. You can feel generalized weakness and fatigue, dizziness or vague fuzzy-headedness, headache, blurry vision, and flushing. People commonly feel vague chest pressure or discomfort as well, which most often does not indicate any heart damage or dysfunction.

Usually none, but...: "silent killer" is a very fitting description, and this is why it is so important to treat high blood pressure even in the absence of symptoms. Severely high blood pressure (example 180/120) combined with headache, chest pain, or vision change is a medical emergency and deserves a call to 911 to avoid permanent damage or even death.

No symptoms in HTN: The great majority have no symptoms until they have a stroke or heart attack or the heart or kidney fails. They only way to diagnose HTN is to measure the BP correctly: 5 min rest, 3 readings on 3 separate visits. The gold standard is still listening to the BP or using the Omron 907 device. If average is above healthy then you need to do something to get BP to healthy levels. Discuss with your Dr