Extreme heat is one reason why your body may retain too much water, sometimes up to 3 or 4kg. BUT fluid retention also strikes many women when their reproductive-hormone levels are fluctuating ...

Weight gained after a vacation or indulgent weekend is likely caused by water retention, not fat, Kara Mockler, a registered dietitian and training consultant, told Business Insider in 2022.

5. Menstrual Cycle: During their period, women might see a weight change of "3 to 4 pounds" due to water retention caused by hormonal changes. This increase disappears once the cycle is over.

This is nothing but water retention (the medical term for it is edema). Fluid retention takes place in the circulatory system or within tissues and leads to swelling in hands, feet, ankles and legs.