Pain is one of the most complicated processes in the human body. You may have experienced this if you’ve ever seen a physiotherapist for pain in one part of your body, and they started to treat an entirely different area. Some people are born with no sensation of pain at all, and amputees sometimes continue to feel pain where their limbs used to be. The complexity of pain is one of the reason’s why physiotherapists conduct such a thorough physical examination before being able to determine the exact source of your pain.
Why is pain so complicated?
Unfortunately, we are still don’t completely understand everything about the way pain is processed. Usually, when an injury or damage occurs to body tissues, a signal is sent to the brain, which begins to interpret this signal and creates the sensation of pain. Pain is thought to be a warning signal to let you know to avoid danger and pay attention to the injured body part. Occasionally this system goes a little haywire, and pain signals are sent when there is no damage or the location of the pain is misdirected.
Referred pain is the term used when pain is felt at a different location to the source that is sending the pain signal. There are many kinds of referred pain, and some are easier to explain than others.
What are the different types of referred pain?
In some cases, if it is a nerve that is sending the pain signal, then pain can be felt all along the length of the nerve. Patients often describe this as a sharp burning pain along the skin. One of the most common examples of this is sciatica, where the large nerve that runs down the back of the leg is irritated around the lower back. The source of the pain signal is near the spine. However, that pain follows a distinctive pattern down the leg. In other cases, it is the muscles and not the nerves that are referring pain elsewhere. Muscular trigger points are taut bands that develop within muscle tissue that is undergoing abnormal stress. Poor posture, lack of movement, and overuse can cause muscles to develop areas of dysfunction. These trigger points can cause pain that radiates out in distinctive patterns. Trigger points are diagnosed as the source of pain if symptoms are reproduced when a therapist presses on a specific point.
If that wasn’t confusing enough, we know that our internal organs also refer pain. Pain referred by internal organs is frequently described as a deep, ache, and usually not influenced by movements of the limbs or back. Organs often distribute pain in patterns that are very obscure and sometimes don’t even create any pain at their location. For example, kidney pain often feels like lower back pain. Tragically there have been patients who have failed to seek treatment in time as they mistook a serious condition for a simple backache.
There are many other fascinating aspects to pain, and understanding how it works is an important part of managing your symptoms. To understand how referred pain may be affecting you, chat to your physiotherapist who can help with any questions.