Differential Diagnosis for Forgetfulness since 3 months

Single most likely diagnosis

• Depression: Forgetfulness can be a symptom of depression, which is a common condition that can present with cognitive symptoms such as memory loss, difficulty concentrating, and making decisions. The relatively short duration of 3 months also aligns with the onset of depressive episodes.

Other Likely diagnoses

• Anxiety: Similar to depression, anxiety can impair cognitive function, leading to symptoms of forgetfulness. The stress of anxiety can affect memory and concentration.
• Sleep Disorders: Chronic sleep deprivation or disorders like insomnia, sleep apnea, or restless leg syndrome can significantly impair memory and cognitive function, leading to forgetfulness.
• Medication Side Effects: Various medications, including sedatives, antidepressants, antihistamines, and some cardiovascular drugs, can cause forgetfulness as a side effect.
• Vitamin B12 Deficiency: A deficiency in vitamin B12 can lead to neurological symptoms, including memory loss and difficulty with concentration.

Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)

• Alzheimer's Disease: Although less likely given the short duration, early-onset Alzheimer's disease can present with memory loss. Missing this diagnosis could delay crucial interventions.
• Thyroid Disorders: Both hyperthyroidism and hypothyroidism can cause cognitive symptoms, including memory loss and difficulty concentrating. These conditions are treatable and can have significant consequences if left undiagnosed.
• Brain Tumors: Although rare, brain tumors can cause cognitive symptoms, including memory loss, depending on their location. Early detection is critical for treatment and prognosis.
• Chronic Subdural Hematoma: More common in the elderly, chronic subdural hematoma can present with gradual onset of cognitive symptoms, including memory loss, and requires urgent medical attention.

Rare diagnoses

• Huntington's Disease: A rare genetic disorder that causes progressive damage to the brain, leading to cognitive decline, including memory loss, but typically presents with motor symptoms as well.
• Creutzfeldt-Jakob Disease: A rare, degenerative, fatal brain disorder that can cause memory loss, among other cognitive and neurological symptoms.
• Normal Pressure Hydrocephalus (NPH): A condition characterized by an accumulation of cerebrospinal fluid in the brain's ventricles, leading to increased pressure and symptoms that can include memory loss, but is more commonly associated with gait disturbances and urinary incontinence.