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It is a known fact that the hormones in oral contraception (estrogen & progestogen) may cause water retention in some individuals, resulting in increased weight. This is normally not.
therapeutic effects
Therapeutic effects

Helpful effects of the pill experienced by the great majority of women include

Predictable timing of periods9
Less painful periods7,9
Lighter shorter monthly flow9
Helps reduce pre-menstrual tension2,3
Relieves moods and irritability2,3
Has a positive effect on the skin 3