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Occasional changes in period pattern are common. If the bleeding is associated with cramps and clots, then you should consider visiting your doctor at the earliest to rule out any hormonal issues or uterine problems, pregnancy etc. If the bleeding continues for more than 10 days, a thorough evaluation should be done to rule out bleeding problems, anemia, hormonal derangements, thyroid hormone problems etc., which could be responsible for the prolonged bleeding.
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