Can hypothyroidism cause frequent spotting?

Mid cycle spotting is not uncommon, and it occurs around the time of the ovulation, due to a temporary drop in the levels of hormones (which helps to build up the inner lining of the womb). If you have taken the birth control pill and it stops the mid cycle spotting, it indicates ovulation as the likely reason for the mid cycle bleeding. This is because the birth control pill works by inhibiting ovulation (hence preventing pregnancy). Usually mid cycle spotting due to ovulation lasts 1-2 days and clears quickly.

It may be helpful if we explore some of the causes for this intermittent bleeding - sometimes termed as "breakthrough bleeding". If the pill is not taken on a daily/regular basis, the temporary drop in the level of hormones can lead to intermittent bleeding. If you are on any long term medication (eg some antibiotics or anti-epilepsy medication) that increases hormonal metabolism/ breakdown, this can lead to a lowered level of the contraceptive hormone and this can also lead to bleeding.