Yes, you can lose money if you invest in stocks. This can happen if you sell the stock for a lower price than you paid for it. Stock prices fluctuate depending on factors like market conditions, political events and company performance. The company may also go bankrupt and liquidate assets to pay back debtors.
All investments -- including stocks -- carry a degree of risk. There's always a chance that you can lose the money you invested, so it's important to only invest funds you can afford to lose.