functional diarrhea

例句：

1. 1. He experienced a sudden onset of functional diarrhea, which made him feel extremely uncomfortable.
   他突然患上了功能性腹泻，这让他感到非常不舒服。
2. 2.The doctor diagnosed her with functional diarrhea and prescribed some medication for her.
   医生诊断出她患有功能性腹泻，并给她开了一些药。
3. 3. Many people suffer from functional diarrhea due to stress or anxiety.
   许多人因为压力或焦虑而患上功能性腹泻。