There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Oversold Rally — 0r More?
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A strong oversold rally, aided by some earnings reports, has carried $SPX
back up to its 20-day moving average. It remains to be seen, though, if it
can fo...
12 minutes ago