What Are the Causes of Mental Fog & Loss of Memory?

Potential causes of lethargy, fatigue and brain fog are numerous. Identifying a single source can be difficult because many of the associated conditions share multiple symptoms. Individuals should discuss their medications, family medical and mental health histories and diet with a medical professional to determine the most likely cause.

Mental Illness

• The National Alliance on Mental Illness lists impaired concentration, decreased energy and slowed speech as typical symptoms of major depression and other psychiatric disorders.

Chronic Fatigue Syndrome

• The U.S. Centers for Disease Control and Prevention includes exhaustion and brain fog among symptoms of chronic fatigue syndrome (CFS), an incurable and disabling condition.

Fibromyalgia

• The National Institutes of Health provides information on the symptoms of fibromyalgia, a chronic pain condition. Sufferers commonly experience lethargy, fatigue and brain fog.

Dehydration

• A study conducted by Tufts University revealed dehydration symptoms include impaired concentration, tiredness and negative mood.

Medication

• Causes of lethargy, fatigue and brain fog include medications and supplements. The U.S. Food and Drug administration reports kava supplements can cause sedation and sleep medication can result in disorientation and impair mental clarity.