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High-risk events trigger a near-immediate disease check. Each event puts the player character at an increased risk of contracting an illness.
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In addition to poor sleep quality, causes of disease risk include: using chems, eating anything (but especially bad or uncooked meat), cannibalism, drinking or swimming in irradiated water, being in rain, drinking Nuka-Cola, and taking damage from feral ghouls, bugs or other infected creatures. All checks upon sleeping also clear the risk pool down to the minimum, after the check. All checks that don't produce a new disease cause a small drain down of the risk pool. Checks are not "rolled for" unless the chance is 25%+.Īll checks resulting in a new disease, clear the risk pool down to its minimum value (which depends on current Fatigue level). Apart from these two situations, risk exposure simply increases the probability (disease risk pool) of getting a disease at the next check. A check is also made when going to sleep. Regardless of risk exposures, the bed slept in and the duration of sleep, there is always a slight chance of contracting illness when going to sleep (but announced upon waking) sleeping for short periods of time (to save the game, for example) may increase this chance overall, due to an increased number of (shorter) sleep sessions, although all sleep sessions after the first will be at the minimum probability, assuming no further risk disease exposures between sleep.Īn immediate check for contracting a disease is made 30 real-time seconds after high-risk exposure. Illness chance, in general, is increased by all forms of Fatigue but does not directly impact Action Points.
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See disease durations for more information. Untreated Illness generally persists for 2–7 days (preferably while remaining well fed, hydrated and rested, eating low-risk food and drink, otherwise further diseases are likely). The risk of contracting specific illnesses can be reduced by taking the appropriate herbal remedy prior to the disease check. In Fallout 4, the Sole Survivor can become ill in Survival mode.Īll illness can be cured with antibiotics, resting for several days, or by paying for the Cure Health service from any doctor.
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