Thyroid deficiency alone can cause some depressive symptoms. Together with unipolar major depression, thyroid deficiency can make depressive symptoms worse and make major depression harder to treat. If you feel slowed down or exhibit symptoms of depression, you should ask your doctor for a thyroid test if you have not had one within six months. Three laboratory tests for thyroid function many psychiatrists use are TSH, serum Free-T4 and serum Free-T3.

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• Could a medication I’m taking make me feel depressed?
• What is the most common medical cause of depressive symptoms?
• Could my chronic medical condition be causing symptoms of depression?
• How does the depression that follows a brain injury differ from unipolar major depression?
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• What is dysthymia?
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• Is there a biological reason for depression?
• How do these negative thoughts affect me?
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• What’s the relationship between brain chemicals and depression?
• What part of the brain is responsible for depression?
• How many people are affected by clinical depression?
• What exactly do you mean when you talk about stress?