What Causes Pain In The Joints?

Okay so for the past few months i've been bruising really easily and even if i get a full night of sleep i will be tired through out the day and i have terrible bags under my eyes..every once in awhile my joints hurt even if i haven't done anything. I looked up some information on these symptoms and it's been boiled down to an iron deficiancy or leukimia but i don't know if it's all accurate. I would like some insight please!!