Hi, dear I have gone through your question. I can understand your concern. You have sore throat. You should go for warm saline water gargling. There is no harm in that. It is very helpful. It will not increase your blood pressure. Don t worry about blood pressure. Just be relaxed. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health.