Use "flaring up" in a sentence

1. Ahmed and Francis were bored and Gus said his prostrate was flaring up.

2. The recurrent Aphtha caused by flaring-up of deficient fire due to deficient cold of spleen and stomach is very common

3. Is ‘OK, boomer’ an Ageist slur? These 18 hilarious takes say definitely not Generational warfare is flaring up online, but everyone can agree this bad tweet deserved all of its mocking responses.

4. To be sure, the Tea Party’s brand of aggrieved populism – and its composition of mostly white, angry, middle-class voters – has deep roots in the United States, flaring up during times of change.