Most commonly, patients describe acute tenderness in the buttock and sciatica-like pain down the back of the thigh, calf and foot. Typical piriformis syndrome symptoms may include: 1  A dull ache in the buttock. 2  Pain down the back of the thigh, calf and foot (sciatica). 3  Pain when walking up stairs or inclines.
There are currently 10 sectors and 68 industries. Three of the 68 industries do not have companies represented in the S&P 500 Index; therefore, performance is not available for Marine, Transportation and Infrastructure, and Water Utilities.
Almost all economies are comprised of four, high-level sectors, which are then each made up of smaller sectors. Of the large sectors within an economy, the first is called the primary sector and involves companies that participate the extraction and harvesting of natural products from the earth, such as agriculture, mining and forestry.