Thank you for reading my post. Some people believe the swelling depicted in Claudius’ neck was indicative of his having a goiter.
https://www.forumancientcoins.com/board/index.php?topic=26074.0&srsltid=AfmBOopzs5D_su_nC993MbXUWT5BQHFP7enx_Fbxdmhsbvsp4mefTjoc
A goiter is caused by an iodine deficiency. The thyroid requires iodine for normal function so it enlarges if there is an iodine deficiency to capture all the iodine it can. Below is a picture of someone with a goiter
Compare the picture above with this other coin of Claudius (from Wildwinds.com)
Of course, no one knows for sure, but it is an interesting observation.
Addendum: It’s interesting to see the progression of neck swelling of Nero as he grew older (and fatter).