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What causes depression, tired and unable to concentrate? 7 possible conditions

See a list of possible causes in order from the most common to the least.


Acute Stress Disorder

In the weeks after a traumatic event, you may develop an anxiety disorder called acute stress disorder (ASD). ASD typically occurs within one month of a traumatic event. It lasts at least two days and up to one month...

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This condition is considered a medical emergency. Urgent care may be required.

A concussion is a mild traumatic brain injury. Usually it occurs after an impact to your head or after a whiplash-type injury. A concussion can cause many severe symptoms that affect brain function.

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PMS (Premenstrual Syndrome)

PMS symptoms start five to 11 days before menstruation and typically go away once menstruation begins. The cause of PMS is unknown.

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Bipolar Disorder

Bipolar disorder mental illness marked by extreme from mania to depression. Bipolar disorder is also called bipolar disease or manic depression.

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Multiple Sclerosis Overview

Multiple sclerosis (MS) is a chronic autoimmune disease that affects the central nervous system. MS can cause varying symptoms that appear with a wide range of severity, from mild discomfort to complete disability.

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Postpartum Depression

Postpartum depression affects as many as 13 percent of new mothers. In the U.S., that's half a million women. Learn about symptoms, causes, risks, and more.

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Hashimoto's Disease

Hashimoto's disease is a condition that damages the thyroid's ability to function properly. It can cause a goiter, or enlarged thyroid, which can make the front of the neck look swollen.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.