30 Thyroid Symptoms That Are Too Important to Ignore

25. Weight Gain

Thyroid problems can mess with your metabolism in a big way. When your thyroid isn't working properly, it can slow your metabolism down, which means your body burns fewer calories. As a result, you might find that you're gaining weight---even if your eating habits haven't changed. And even if you try to exercise, the fatigue that often comes with thyroid problems can make it hard to stay active.