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NASA classification of space motion sickness (SMS) according to the severity of symptoms.
| None | No signs or symptoms reported |
|---|---|
| Mild | One or more transient symptoms No operational impact All symptoms resolved in 36–48 h |
| Moderate | Several symptoms of a persistent nature Minimal operational impact All symptoms resolved in 72 h |
| Severe | Several symptoms of a persistent nature Significant performance decrement Symptoms may persist beyond 72 h |
