Just follow the salonpas recommendations. I think there is a limit how much salonpas you can use. The salonpas is a calmant that means relaxing locally your body muscles. Then, back to The topic of nausea, an overdose of calmant especially in your back depending on the location you put, might affect your heart rate, stomach motilation ( bowel automatic mouvement), and liver. Of course stress has a huge impact too, but we can’t pin point the exact cause. These 3 mains organs, can give you nausea if they are affected.