"Side effects" refer to unintended reactions or consequences that occur when taking a medication or undergoing a treatment. While many people take medications to improve their health, these drugs can sometimes cause additional symptoms that were not the primary goal of the treatment. For example, a person taking pain relievers might experience stomach upset as a side effect. It's important to be aware of potential side effects, as they can vary from mild to severe. Some common side effects include nausea, dizziness, or fatigue. Always consult with a healthcare professional if you experience unusual symptoms after starting a new treatment, as they can help manage these effects effectively.