Infrared light can offer relief for chronic pain through improved circulation, reduction of tissue inflammation and degradation of the tissue matrix (muscle and connective tissue).⁠ (Source) Red light therapy is also good for relieving joint stiffness. This is likely due to the fact that red light therapy can enhance the cell signaling pathways involved in bone formation, repair, and proliferation. Red light therapy “significantly reduces” the severity of arthritis. Three to four sessions are needed per week for one month to treat pain.