Have you been feeling more anxious than usual and not been able to pinpoint the cause? Are you experiencing mood swings, problems with concentration and brain fog during your day to day activities? You may be surprised but hypothyroidism could be the underlying cause of your anxiety or feeling on edge. We all know that thyroid affects the whole body: your metabolism, your energy and your weight but did you know that it can affect your mood and mental health too? Untreated hypothyroidism is closely linked with anxiety and even depression.