Hi i've been to the hospital for feeling faint and weakness in my legs. blood test has shown an overactive thyroid. can this cause these symptoms ? i hate the feeling of feeling faint. and nauseous. dr isn't worried right now due to other tests done?

Hyperthyroidism can cause severe muscle weakness,weight loss, rapid heart rate and systolic hypertension. Work with your team to see which type you have as that will determine how to get you back to good health.

Yes, overactive thyroid can easily be the culprit in a young otherwise healthy person. Correct the known abnormality before determining need fir further testing.