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.
A sector is a segment of the economy that includes companies providing the same types of products or services. For example, the utility sector provides electric power, natural gas, water, or a combination of these services.This sector may also include companies who produce power and those that trade it. set of securities or individual companies that are similar to each other. For example, all automotive companies in the United States are said to belong to the American automotive sector.