'Mad Money': What to Worry About for 2018

Part of being a great investor is being prepared for anything, Jim Cramer told his Mad Money viewers Wednesday. That's why Cramer outlined his Top 10 Investment Worries for 2018 -- so viewers won't be blindsided and can prepare for what might happen next.

First on the list was the federal tax plan, the potential failure of which could be devastating for the domestic stocks that have been rallying for weeks. Second was North Korea, which doesn't appear to want to give up its nuclear ambitions. In third place was the Mueller investigation, which remains a wildcard as to what that might turn up.

Cramer said he's also worried about valuations and he fears fund managers could begin taking profits after the first of the year. He also has concerns about cryptocurrencies, which are starting to be viewed as actual investments, despite being nothing of the sort.

Also on the list, concerns over interest-rate hikes. Cramer said that, eventually, rate hikes hurt stocks, something younger investors may have forgotten.

Rounding out the list were antitrust concerns at No. 7, the loss of state and local tax deductions at No. 8, and the cost of healthcare for millions of Americans in the No. 9 slot.

Finally, Cramer said cyber attacks complete his list of worries, as they're only getting bigger and more frequent and you never know where they will strike next.

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