Muscle knots is the other term for hypertonicity. It means that your muscle fiber is sticking to each other creating lumps or tightness. When that happens, you immediately feel the pain. Hypertonicity occurs for several reasons; stress, lack of water, injuries, overwork among other causes.
There are several ways of relieving muscle knots such as massage therapy for alternative health treatment, hot stone to help melt those knots, stretches, drinking lots of water, getting enough rest, eating healthy and cut the stresses.