Neck pain and fatigue are caused by overworking the muscles in a similar way to working out at the gym. The body sends signals to indicate the need for rest and replenishment. The neck is responsible for supporting the weight of the head, and if it becomes misaligned or tilted, gravity puts more strain on it. Using electronic devices with poor posture also contributes to neck fatigue. Being conscious of these factors can help prevent neck pain and fatigue.