Why am I always tired? 22 medical reasons for feeling tired

We all experience tiredness at times, which can be relieved by sleep and rest. Fatigue is when the tiredness is often overwhelming and isn't relieved by sleep and rest. Here are 10 health conditions known to cause tiredness or fatigue.Feeling tired all the time? Well, you're far from alone. Two out of every five Americans report feeling tired most of the week, and research from the Centers for Disease Control and Prevention shows that 1 in 3 adults fails to get enough sleep. And between work or school, family or friends, and all the other commitments we're juggling, it's easy to blame a busy lifestyle on constant fatigue.But if you're always asking yourself, "Why am I so tired?" don't blow it off. Give yourself about 2 to 3 weeks to make some lifestyle changes: Trim your social schedule, scale back your workload at the office, and try to sleep more. "If you're still feeling the symptoms of fatigue after those changes, then you need professional help," says Sandra Adamson Fryhofer, MD, an internal medicine doctor in Atlanta. Excess exhaustion could be the sign of a more serious medical condition that can be treated.