3 sentences

1. 我最近吃火锅上火了。

   wǒ zuì​jìn chī huǒ guō shàng​huǒ le.

   I've developed internal heat from eating too much hot pot recently.

   Source: Dong Chinese Dictionary

2. 最近吃太多荔枝，我上火了，嗓子有点疼。

   zuì​jìn chī tài duō lì​zhī, wǒ shàng​huǒ le, sǎng​zi yǒu​diǎn téng.

   I've been eating too many lychees lately and have developed 'internal heat,' so my throat is a bit sore.

   Source: Dong Chinese Dictionary

3. 别为这点小事上火，不值得。

   bié wèi zhè diǎn xiǎo​shì shàng​huǒ, bù zhí​de.

   Don't get worked up over such a small matter; it's not worth it.

   Source: Dong Chinese Dictionary