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An irregular narrowing of a blood vessel, duct, canal or tube.

See a healthcare professional right away if:

• Chest aches or pain.
• Breathing problems.
• Pain, numbness, or weakness in arms or legs.
• Urinating less than usual or not at all.

Make an appointment to see a healthcare professional if:

• Feeling very tired.
• Difficulty fully swallowing food.
• Cough won't go away.
• Belly pain.