Incontinence during menopause is primarily caused by the weakening of the pelvic floor muscles. These muscles support the bladder, bowel, and uterus. They are responsible for holding in urine and prevent leakage by contracting, for instance, when you sneeze, jump, or lift something. During urination, the muscles relax, allowing you to empty your bladder.
It’s normal for pelvic floor muscles to weaken after pregnancy and as you age. During menopause, as your ovaries produce less oestrogen and progesterone, the pelvic floor muscles may weaken further. The decline in oestrogen, in particular, plays a significant role.
Oestrogen is a vital hormone involved in muscle growth and repair. When oestrogen levels drop, it affects your muscles, including the pelvic floor muscles. The function of the sphincter muscles and surrounding connective tissue also diminishes, which can lead to involuntary urine leakage.
A study by Kołodyńska, Zalewski, and Rożek-Piechura (2019) estimates that up to 50 per cent of all women in menopause experience incontinence. Without targeted training of the pelvic floor muscles, their strength can gradually decline during menopause, worsening incontinence.