The readings are the kun'yomi vocab readings (hint is that there's hiragana sticking out there). So, just make sure you know the word 胸 and 焼く. If you do, you can combine that knowledge into this word, and hopefully not get any heartburn in the process.
How many times can you jump rope when you're suffering from heartburn?
It may be because of my age, but I get heartburn when I eat deep-fried food.
Don’t you get heartburn from eating katsu-don in the morning?