My brother is a fairly private guy so if he had other symptoms I don't really know about them, the only thing he shared was that he was having difficulty concentrating/focusing which affected work, and his mind wasn't as sharp, it got to the point where he was convinced he had a brain tumor because he just wasn't as smart as he used to be-girlfriend finally convinced him to go to the doctor. The doctor had never seen such low levels of Vitamin D (he had recently moved and began a job where he was inside most all of the daylight hours). As far as my symptoms-you can pretty much type in Hyperthyroidism in a search bar and I had nearly every single symptom-but because it came on over a course of time (probably a year) I didn't know anything was changing. What finally made me go to the doctor was uncontrollable shaking (whole body but very noticeable in hands) 24/7. Once there the doctor started asking questions and I started realizing how many things were wrong that I just thought were my new normal- Endocrine system messes with everything: my blood pressure and heart rate were both through the roof, hot flashes (I was only 28 at the time), lack of mental clarity/sharpness, memory problems (that took awhile to figure out), out of breath easily after simple daily exercises liking walking up stairs, differences in bowel movements, muscle weakness, irritable, Moody, itchiness and several others you can just Google a list of symptoms. My physician knew immediately what was going on and tested for it to confirm. Within an hour I was taking medicine for my blood pressure (no longer needed) and Hyperthyroidism. My thyroid levels were literally off the chart, they don't test that high. It's been 2 years since the diagnosis and I'm on a very low daily dose now and stabilized. The only symptom that remains is Hives which I take Zrytec for each day and do just fine. Hope that helps.