The onset of symptoms is generally later in BMD than in DMD, and can occur anywhere from 5 years of age to young adulthood. As in DMD, in families where there is a positive history of muscular dystrophy, BMD can be detected or ruled out in infants by means of a blood test. Again, initial symptoms are similar to Duchenne, only milder in severity. The rate of progression is slow. Many people with Becker muscular dystrophy are able to walk well into their teens and adult years.
Life expectancy is, in many cases, normal.
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