Hypogonadism is when your sex hormones are low (testosterone in men and oestrogen in women) and could be due to a primary or secondary cause.
Primary hypogonadism
Primary hypogonadism is where your gonads (testes in men and ovaries in women) do not work normally.
Secondary hypogonadism
Secondary hypogonadism occurs when the pituitary gland in your brain is not able to produce hormones to stimulates your functioning gonads.