HIGH blood pressure does not cause obvious symptoms, however when pressure is extremely high, an odd sensation can be felt in the chest, neck or ears warning of hypertension.

Not much is known about coronary slow flow, a condition in which arteries fill with blood more slowly than normal – even without fatty plaque deposits. The condition causes severe chest pain.

"Blood test helps predict heart attack risk for patients with chest pain." ScienceDaily. ScienceDaily, 31 March 2014. <www.sciencedaily.com / releases / 2014 / 03 / 140331114459.htm>.

Irregular heartbeat: Irregular heartbeat is caused due to lack of blood and oxygen flow. Chest tightness: This is the most common sign of blocked arteries.