Is it hyperhidrosis?

For a while now... i cant remember when i didnt have this... but my hands have been sweaty mostly 24/7 maybe for about only 15 seconds or so maybe 1 min every now and then i will get normal dry hands... but i never knew if having constant clammy sweaty hands was bad but i heard of hyperhirdrosis and i dont know if i would have it or not because it is constantly sweaty... just rubbing them once will make them even more sweaty... im not sure if i have hyperhidrosis or not but it seems it... what should i do? is it serious at all or common or what because i dont know too much about it.