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What causes your cycle to change from 28 days for years to 21 days for the last couple of months?
Wiki User
∙ 9y ago
There are a number of factors that can cause a change to your cycle from 28 days for years to 21 days for the last couple of months. Significant weight loss or weight gain, stress and certain medications can all have a part to play in the change of a woman's monthly cycle.
Wiki User
∙ 9y ago
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