He knew Qin Xiangnuan very well, considering her typically reserved and uncommunicative nature. Without her saying anything, no one would know her issues; thus, he had to intervene and care for her. Marrying such a girl means he's both tired and overjoyed.
Qin Xiangnuan breathed a sigh of relief, glad that the excuse was acceptable to everyone. Hopefully, Li Qiuhua didn't feel too embarrassed either, for indeed, she had been consuming too much nourishment recently, leading to constipation from the resulting "heatiness".
Luckily, she stopped drinking more soup. Plus, the system issued her a bottle of medicine, recommending she take one tiny, tasteless pill daily with water. Whether it was due to stopping the supplemental soup or the medicine itself, her constipation did improve.