I have passed 4 kidney stones in the past 7 months. should i be concerened?

Yes: That's a lot of stones. You need a work up to see how many you still may have and what you can do to prevent further stones.

See your doctor: See your doctor and save a stone to get analyzed to see if there is anything to prevent them. Also stay well hydrated with water to keep the kidneys flushed out of crystals that cluster together to form stones. Kidney stones are more common in the summer when people tend to get dehydrated with the heat.