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Thanks Ed for the UK and US analysis.

Its very strange as it only affects Australia. Moz outputs:

11.5-30.3K hives with difficulty at 57

11.5-30.3K urticaria with difficulty at 40

So I guess Moz is considering both Hives and Urticaria differently. I am just a bit wary that the range is the same given the method that is used.

This article shows how they come up with the range https://moz.com/blog/sweating-details-google-keyword-tool-volume

Given Keyword planner (Australia data - see image) gives very different month usage rates - I would expect the range to be different.

OpnY6

I have a question with regards to the monthly search ranges. I read your information on how the range is calculated but it does not explain the following.

Google AU comparison for "hives" and "urticaria". The range give is 11.5-30.3K per month for both terms. This is highly unusual because we know that people use hives more than urticaria when searching for the same disease.

Interesting this is the only medical term that behaves like this and want to understand the reason why.