Bruce Springsteen postpones tour due to peptic ulcer.

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Singer has been working to overcome ailment but situation has gotten worse.

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All September performances have been postponed.

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Springsteen will focus on health and get back on road as soon as possible.

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Peptic ulcers are sores that develop in lining of stomach or small intestine.

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Condition is usually treatable with medication but can sometimes require surgery.

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Springsteen is 72 years old and has been major force in American music for over 50 years.

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He has won 20 Grammy Awards and has sold over 120 million albums worldwide.

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Springsteen's fans are disappointed by news of postponement but are also understanding.

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Springsteen is expected to resume tour in October.

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