Severe word-finding difficulty, brain fog, and fatigue in an adult under 45 with a normal brain MRI: what is worth checking next?

An MRI looks at structure; cognitive symptoms can arise from sleep, autonomic and metabolic physiology outside its view.

A reassuring test only answers the question that test was designed for; discussing its limits may guide the next step.

Bring the original report, medication labels and relevant dates rather than guessing from memory.

Illness onset, post-exertional change and postural triggers are useful distinctions for the next clinical visit.

The timing of this detail alongside the main symptom can influence which questions are asked next.

Your doctor can help decide whether the accompanying finding is connected or coincidental.

Not recognizing another clue does not exclude any particular cause.