Why do i get sick once or twice a year?

Humans!: You must be human, like the rest of us. Humans who get sick once or twice a year might actually be the lucky ones. Many of us get sick 2 or 3 times a year; hopefully not more than that. "Getting sick" means different things to different people. Generally, people take it to mean cold symptoms, flu symptoms, vomiting or diarrhea. One'd doctor can evaluate, if worried.