Trigger points and sore muscles
Trigger points are small tender spots in your muscles. These sore spots feel as if part of the muscle is bunched up and consequently they are often described as muscular ‘knots’.
You can get a trigger point in one of your muscle by directly injuring that muscle itself. However, you can also get a trigger point in a muscle after injuring another part of your body entirely, for example a problem in your neck can cause a trigger point to develop in one of the muscles around your shoulder blade. Trigger points can also be caused by other things like repeating the same activity (using the same muscle over and over again) or sitting in the same position for long periods of time.