Muscle aches, also known as myalgia, are discomfort or pain in the muscles. They can occur due to various reasons, including overuse, injury, or tension. Common activities that lead to muscle aches include exercise, lifting heavy objects, or maintaining poor posture. In some cases, muscle aches can be a symptom of an underlying condition, such as fibromyalgia or an infection. They may also result from stress or lack of sleep. Treatment often involves rest, hydration, and over-the-counter pain relievers to alleviate discomfort and promote recovery.