Not everyday but during and since retuning from a trip, my lips swell. I have not changed anything in my diet recently. But noticed after a meal that I drank sweet tea with either my left upper and lower lip will swell or the right side will swell. I stopped drinking sweet tea but symptoms still occured even with drinking lemonade. Normally between 6-8. I take an antihistamine swelling goes down but this morning they are still swollen. No itching or hive like symptoms.. Just partial swollen lips. Any idea?