Figure 3. Time plots of relative [internet] search volumes (RSVs) for “hypothyroidism+thyroiditis” and “fatigue+weakness” worldwide (3a), and from the southern hemisphere in Brazil (3b), South Africa (3c) and Australia (3d).

Note that in all the data the RSVs for “fatigue+weakness” outnumber those for “hypothyroidism+thyroiditis”. The spike in 2011 in 3b corresponds to a change in data gathering parameters by Google but is not noted in the other regions/countries. RSVs: Relative [internet] search volumes.