Muscle tension refers to the state of contraction in muscle fibers, which can occur during physical activity or as a response to stress. When muscles contract, they become tighter and can feel firm to the touch. This tension is a normal part of muscle function, allowing for movement and stability in the body. However, excessive or prolonged muscle tension can lead to discomfort and pain. Factors such as poor posture, repetitive movements, or emotional stress can contribute to increased tension. Techniques like stretching, relaxation exercises, and proper ergonomics can help alleviate muscle tension and promote overall well-being.