Continuous crying is an early sign of Leigh's disease. The illness mainly affects infants, who obviously cannot tell anyone what kind of symptoms they are experiencing. Crying is expected behavior in infants, of course. However, an abnormal amount of crying can signal there is something seriously wrong with the infant's health. It is not normal for an infant to cry excessively after all of their apparent needs have been met. Leigh’s disease causes a lot of discomfort and feelings of weakness, which results in the infant crying a lot. Older children and adults with Leigh's disease are less likely to have this symptom, as they can describe their discomfort with words.
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