Quite often I feel tired. I get enough sleep, but don't exercise. What could be causing this?

There's so many possible causes, it'd be impossible to list them all. However, here are a few:

Physical
* infectious disease
* chronic fatigue syndrome
* sleep apnea
* out of shape
* new medications
* chronic pain (thanks Red John for pointing that one out)

Mental/Emotional
* stress
* depression

Environmental
* mattress too old / broken
* too much light or noise when you are asleep

If at all possible, schedule an appointment to talk to a doctor about possible physical causes. Meanwhile, assess your environment to see if anything can be improved there. After ruling out those two areas, talk to a counselor or psychiatrist to see if something is bothering you that maybe you weren't even aware of.

Exercise can help releive tiredness as when you exercise you brain releases endorphins that make you feel good.

Many times one thinks they get enough sleep but its the quality,for example,numerous awakenings.Stay away from caffeine,caramel colored soda,like coke pepsi, chocolate, or exercise 3 hours before bedtime.If you find yourself twisting and turning for more than l5 minutes,then get out of bed and do something boring,like reading a book.If you find yourself nodding on the sofa immediately get up and go into the bed,One must retrain the brain in thinking the bedroom is for sleep only.Also the old cliche warm milk before bed is true.Mlk contains tryptophan a natural amino acid that induces sleep.If you find yourself napping in daytime limit it to no more than 20 minutes as then this overlaps into your nighttime sleep,and dont nap later than 3pm.If after this you still find yourself tired,first get complete blood and urine analysis to rule out any anemia possibly,then get evaluated at a sleep center.For further reading on narcolepsy,insomnia as well as sleep centers go to the website sleepnet.com.

A lot of factors play a big part in your question. age, health condition and level of activity. if you have not had a recent physical, this would be the first order of the day. if a medical condition does not exist, try this: l. go to dollar general store and find a good, cheap multiple vitamin and take one every day 2. at least, for fifteen minutes every day, start slow and gradually build on an exercise program and stay with it. as you age, blood does not reach parts of your body and that means loss of oxygen and other important chemicals, necessary for more energy. i always dread exercising, but i feel absolutely great once i have finished. also, remember, the mind controls your body. if you think tired, you will feel tired. also, too much sleep calls for more sleep. five hours of sleep and i am good to go. no, i am not 25 yrs. old and i am not an athlete. i am 62.

Too much exercise can also make someone feel fatigued.

The fact that you do not exercise gives me a strong inclination to say that you lack the energy, enthusiasm, and overall happiness that you could have if you did exercise. I know my explanation is probably not very clear, but I have to say from personal experience and knowing people who are in your same situation claim exercise to do wonders for your emotional, psychological, and physical health. They are all linked to each other so making yourself feel good physically for example by doing some simple exercises will give you more energy and a more positive outlook about things. I know starting to exercise is a very difficult thing to do, but I recommend starting slowly, a bit each day if not only a few days a week at first. Just walking for 20-30 minutes for starters will be refreshing! Before you know it you'll start to feel good. :)

Lack of excercise can make you more tired. I don't know why but it does.

As paradoxial as it may sound, exercise adds energy to your day. The new guidelines include 60 minutes of moderate activity (jog, run, do yoga, pilates, weights, bike, walk, turn on Fitness TV) to maintain weight and health. Cardiovascular activity pumps your heart and improves circulation and proper oxygen distribution through your body. So exercise and feel more energy. If that doesn't work, look at other indicators in your life of unhappiness--job, personal life, school, other stressors and find source of your fatigue. Could be more serious condition, but most likely, just lack of exercise.