When a blood pressure reading registers above 160/100, it is classified as stage 2 hypertension and can be fatal if not properly treated, reports Mayo Clinic. Hypotension, or low blood pressure, is a reading of 90/60 or less, and it can also be life threatening, explains HeathLine.
Some symptoms of low blood pressure are fainting, dizziness, blurred vision and nausea; in addition to fatigue, depression and shallow breathing, states Mayo Clinic. Hypotension is caused by a variety of conditions including pregnancy, dehydration, heart problems, blood loss and poor dieting.
Several variables also contribute to hypertension such as alcohol and drug abuse, thyroid problems, certain tumors, and some prescription medications, explains Mayo Clinic. Symptoms include dull headaches, dizziness and nosebleeds. Consult a physician in regard to experiencing these symptoms.