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
Significant Breakdown Ends Bull Run
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Once $SPX broke down through the important 5050 support level, bearishness
has emerged from several areas. Oversold conditions are beginning to appear
alre...
13 minutes ago