How do i know when anxiety is caused from an underlying medical condition that is being overlooked?

Yes: best way is to see your primary care doctor first to possible obtain a good physical with possible lab orders to rule out various medical conditions that can cause anxiety like symptoms

See a good Dr.: And they will examine you thoroughly and do testing on you to determine any underlying issues if they seem fit. Best wishes.

Knowing? hard. TTYD.: You are more likely to have anxiety from a medical condition if 1. you are 30+ years old, have a medical condition, or a history of substance use/medication abuse 2. it started suddenly and does not correspond to a specific psychiatric diagnosis 3. your vital signs are abnormal 4. you get disoriented, confused or hallucinate 5. your symptoms fluctuate or do not respond to treatment. Get help! TTYD