Stress: When we feel threatened, worried or under pressure, our body releases so-called stress hormones that can suppress our reproductive hormones, leading to irregular periods.
Polycystic ovary syndrome (known as PCOS) is a condition in which the ovaries produce high levels of the male sex hormone androgen, which can disturb ovulation. Read more
Premature ovarian failure occurs when the ovaries don’t produce enough oestrogen or release eggs regularly.
Menopause is when someone has gone 12 months without a menstrual period following a drop in oestrogen and progesterone. Periods can also become irregular during perimenopause, our body’s natural transition phase into menopause.
Hypothyroidism is when the thyroid gland doesn’t produce enough hormones.
Prolactinoma is a very rare, non-cancerous tumour of the pituitary gland, which causes decreased levels of oestrogen and testosterone.