Good day, what would cause restless legs (i hope this is what it's called). i'm only 22 years old. and it is unbearable.

RestlessLegSyndrome: or RLS, usually has no specific cause, kindly check this site fir more information, a good neurologist can help you too, good luck https://www.webmd.com/brain/restless-legs-syndrome/restless-legs-syndrome-rls#1

This may run in families, but can also appear associated with abnormal iron metabolism (check a ferritin level). Some cases have been associated with kidney failures, but this is unusual. Other sleep disorders may accompany. This is relatively easy to control with "dopamine agonists". A neurologist is a good approach.