I have back pain. many say its because of tension. is there any logic behind this?

Muscle tension or: strain is a major component of acute back pain. Given your age, likely back pain or injuries will involve some muscle strain, or muscle spasms may result from the injury. Ice x 48 hrs after initial injury, then use heat. Use acetaminophen (mild pain) or ibuprofen (mild-moderate pain) as needed per directions on the bottle if pain limits your function/sleep.