system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is nausea a side effect for nearly every medication?

It seems like every time I look a medication up or get a pamphlet from a pharmacist, nausea/vomiting is almost always listed under side effects. Even my medications to help with my nausea list it as a side effect! What gives?
gpt
One reason is because when drug companies do drug trials they list all the *problems* that were reported during the trial, even if there is no clear link between the problem and the drug. For example, in the drug trial:
If they give a group of people who are feeling nauseous a drug to stop the feeling and after an hour some still feel nauseous, there's no way knowing if this is because of the drug or the existing ailment. So, they have to record it as a possible side effect. 

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Edit: trial not trail .-.