Weight loss is a common symptom of hyperthyroidism—or an over-active thyroid, dr cappola says this means your thyroid—the butterfly-shaped gland in your neck that helps regulate your. Lost weight randomly. Unexplained weight loss if you lose more than 5% of your weight in 6 to 12 months, tell your doctor, especially if you’re an older adult that would be about 8 pounds if you weigh 150, or 10.
lost weight randomly