Hello and hope you are doing well.
A throat infection is not caused by hypothyroidism. Throat infections can be streptococcal or a viral infection. Strep sore throat needs to be treated with an antibiotic as strep is a bacteria. Viral sore throat is best treated with rest, warm oral fluids and (OTC) tylenol (acetaminophen) or ibuprofen for pain. If you develop a fever, or if there is enlargement of the tonsils with pain or if there is white coating on the tonsils, you will need to consult your primary care physician for a strep test, which if positive you will be given appropriate antibiotics. In the meantime for relief from your symptoms you could do warm salt water gargles and steam inhalations. Please ensure to do this prior to your meals.
Hope this helped and do keep us posted.
thank u so much fr ua valuable advise