Constant pain is the experience of discomfort or aching that lasts for an extended period of time. It may be localized in one area or may be more widespread. It may present as a dull ache, a sharp stabbing sensation, or a burning sensation. It can develop gradually or suddenly, and can range from mild to severe. It can be associated with other symptoms such as swelling, redness, or a decrease in mobility. It is important to seek medical attention if the pain does not improve or worsens over time.