Market swings test investor nerves. Here's how to keep yours steady.

When stock prices drop sharply, panic sets in fast. Your first instinct is to sell everything and lock in losses. Don't. That reaction destroys long-term wealth.

Start by stepping away from your screens. Checking your portfolio every hour during a downturn amplifies stress and pushes you toward reckless decisions. The market fluctuates daily. One week of losses doesn't mean your investment strategy failed.

Review your actual plan instead. If you built a diversified portfolio aligned with your time horizon and risk tolerance, nothing has changed fundamentally. A 20-year-old saving for retirement can absorb a 30 percent market drop because they have decades to recover. Someone retiring next year shouldn't have been heavily invested in stocks anyway.

Rebalancing works powerfully during downturns. If your target allocation is 60 percent stocks and 40 percent bonds, and a crash drops stocks to 50 percent of your portfolio, buying more stocks at lower prices accelerates recovery. This forces you to act rationally instead of emotionally.

Check your emergency fund. If you have three to six months of expenses in a savings account, you never need to sell investments during a downturn. This cushion lets you ignore short-term noise.

Focus on what you control. You can't predict markets. You can control spending, contributions, and fees. If you're in expensive mutual funds charging 1 percent annually, switching to low-cost index funds through Vanguard, Fidelity, or Schwab saves thousands over your lifetime.

Talk to a financial advisor if emotions run high. A good advisor reminds you why you invested initially and keeps you on track through volatility.

History shows markets recover. The S&P 500 rebounds from every crash eventually.