A dose of under 100 rad will typically produce no immediate symptoms other than blood changes.
If there is a lot of bleeding, immediate symptoms occur and resemble a stroke.
But it is also possible to experience low-grade, ongoing stress without those immediate symptoms.
For some who come, therapy focuses only on relieving the immediate symptoms.
House and team struggle to diagnose a young girl whose cancer is not causing her more immediate symptoms.
No one in the Czech unit complained of any immediate symptoms, he added.
Long-term preventive treatment should begin after the patient recovers from immediate symptoms.
Only about 1 percent of those infected show immediate symptoms, which can include fever, malaise and swelling.
When a person is well, missing a dose, or even several doses, may produce little in the way of immediate symptoms.
In context, immediate symptoms become apparent if exposed to above 250 mSv per day.