Why Sciatica Muscle Pains Occur. Both the piriformis and the sciatic nerve begin at your tailbone (coccyx). The piriformis crosses directly on top of the sciatic nerve, and this is what causes the problem. When the muscle goes into a spasm it presses down directly onto the nerve, pushing it into the bone underneath. And you get the terrible pain of sciatica.
Low blood pressure. Low blood pressure occurs when blood pressure is much lower than normal. This means the heart, brain, and other parts of the body do not get enough blood. Normal blood pressure is usually between 90/60 mmHg and 120/80 mmHg. The medical name for low blood pressure is hypotension.
Although blood pressure varies from person to person, a blood pressure reading of 90 millimeters of mercury (mm Hg) or less systolic blood pressure (the top number in a blood pressure reading) or 60 mm Hg or less diastolic blood pressure (the bottom number) is generally considered low blood pressure.efinition. Low blood pressure (hypotension) would seem to be something to strive for. However, for many people, low blood pressure can cause symptoms of dizziness and fainting. In severe cases, low blood pressure can be life-threatening.