3. Acne
Thyroid issues can cause a range of different side effects that you might not initially think could be related. For example, an underactive thyroid can result in too little thyroid-binding globulin. This means that there will then be too much thyroid hormone for the cells, in turn resulting in receptor sites shutting off.
This is often seen in conjunction with elevated testosterone levels. That might sound like a good thing but it can actually result in mood swings and acne – both of which are very unpleasant and things that most of us expect to grow out of when we leave puberty.