Hi, !
While a hoarse voice isn't a typical symptom of Lupus, it could be related to your Lupus, depending on what is behind the hoarseness. Swollen glands can be a symptom of Lupus and that could, in theory, impact your voice. And, secondary conditions like Sjogren's like to tag along with a Lupus diagnosis and Sjogren's can cause vocal issues. But, as you mentioned, it could be related to your thyroid issues. If you haven't done so already, I wouls mention this to your doctor and if he/she doesn't have any answers, you can ask for a referral to an ENT if the hoarseness is especially annoying for you.
Best, Erin, Team Member.