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
Real Madrid’s Ancelotti Praises FC Barcelona Youngsters Ahead Of El Clasico
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Real Madrid coach Carlo Ancelotti praised FC Barcelona teenage prodigies
Lamine Yamal and Pau Cubarsi ahead of El Clasico between the two arch
rivals.
5 minutes ago