I have posted to this effect in the past: My knowledge gained as a longstanding hypothyroid patient is that whenever anyone suffers a significant illness, their thyroid levels can suffer as a result, and take their jolly old time rebounding. For this reason doctors do not consider serum thyroid labs true indicators of thyroid functional ability in the aftermath of such illnesses, I understand. What can help thyroid hormones in rebounding is testing for serum Vitamin D, Folate, Ferritin and Vitamin B-12, then optimizing these levels as needed (with physician guidance so that you do not go masking a condition in need of proper diagnosis). This I have learned on dedicated thyroid support group sites, and found personally helpful. Checking these labs may assist with helping your thyroid along in rebounding from a illness setback.

I am willing to bet that if some post COVID-19 symptom sufferers were to review list(s) of thyroid condition symptoms a percentage will feel right at home. This is because you are at home until your thyroid levels slowly recover following your illness. I recently listened to a Zoom session by the American Thyroid Association and they said they have been seeing a higher percentage of one particular thyroid condition (that I am unfamiliar with, and have not put my hands on my notes, I have some brain fog too!) they feel is related to this pandemic.