Complications

Complication
Timeframe
Likelihood
short term
medium

Vaginal bleeding is common in the first 4 to 6 months with oestrogen and progestogen therapy. If necessary, more progestogen may be added to a continuous oestrogen-progestogen regimen.

Changing to a cyclic combination regimen results in the woman having monthly withdrawal bleeding.

Persistent postmenopausal vaginal bleeding requires further investigation.

short term
medium

This is a complication of oestrogen treatment. The dose of oestrogen should be decreased.

Persistent symptoms require further investigation.

long term
medium

The menopause transition is a period of accelerated cardiovascular disease risk.[21][95]​​ Women with premature or early menopause (before age 40 or 45 years, respectively) have an increased risk of cardiovascular disease.[95][96]

variable
low

Observational studies and a meta-analysis indicate that transdermal oestrogens are associated with a lower risk of venous thromboembolism (VTE) than oral oestrogens.[1]​​​[47][48]​ The risk of VTE is higher if hormone therapy is initiated after age 60 years or more than 10 years from menopause onset.[17]

variable
low

Hormone therapy with an oestrogen alone is associated with little or no change in the risk of breast cancer.[1]​ An oestrogen prescribed in combination with a progestin is associated with a small increase in the risk of breast cancer.​[1][47][48]​​[Evidence C]​ The increased risk is related to duration of treatment, and likely recedes after treatment is stopped.[1]​​[47][48]

variable
low

The risk of venous thromboembolism and ischaemic stroke increases with oral hormone therapy, but the absolute risk of stroke in women under 60 years of age is very low.[1]​​[47][48]​ Data on the risk of haemorrhagic stroke in women using hormone therapy are inconsistent and lacking.[20]

Observational studies and a meta-analysis indicate that transdermal oestrogens are associated with a lower risk of venous thromboembolism and stroke than oral oestrogens.[1]​​[17]​​[47][48]

variable
low

Vaginal and urogenital epithelial thinning occurs with the menopause and can lead to increased susceptibility to urinary tract infections. Vaginal (or systemic) oestrogen replacement can improve the thickness and health of the perineal epithelium and lower the rate of recurrent urinary tract infections.

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