Why Do You Feel Tired When Depressed?

Tiredness is one of the classic symptoms of depression. According to the National Institute of Mental Health, certain areas in the brains of depressed people function differently than the brains of those who aren't depressed. This difference may be the root cause of fatigue.

Chemistry

• Researchers have found three neurotransmitters---serotonin, norepinephrine and dopamine---are linked to depression. When our brains lack sufficient quantities of one or more of these neurotransmitters, it not only causes negative emotional changes, but it can be detrimental to our sleep and appetite patterns.

Sleep

• Not getting enough sleep and sleeping too much are both symptoms of depression that can contribute to feeling tired. Avoid drugs and alcohol, since they can disrupt sleep.

Diet

• People who are depressed often either don't eat enough or eat so much they gain a lot of weight. If you're not giving your body the right amount and type of fuel to do its job, then your energy level suffers.

Illness

• An underlying medical condition can cause fatigue. Some diseases linked to depression include heart disease, diabetes, cancer and Parkinson's.

Medications

• Antidepressants are a class of drugs designed to regulate the brain's neurotransmitters. Your doctor can recommend an antidepressant that's best for you.