At most, you might face some digestion issues for a while which should clear in about a day. In most cases, nothing will happen if you eat partially undercooked potatoes. Eating completely or significantly undercooked potatoes could at most cause some digestion problems for a day or two.
What happens if you eat slightly raw potato?
Though attempting to digest raw starches isn't going to cause you any lasting bodily harm, the raw potato will pass through the digestive tract with very little breakdown, likely leading to an increase in unpleasant cramping, bloating, and gas production.
Are slightly undercooked potatoes safe to eat?
No, you shouldn't. Potatoes require proper cooking to swell the starch granules. The flavor and texture of eating an undercooked potato are unappealing.
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