10/14/2026
It may be tempting to assume it is “just hormones,” but thyroid function can also affect your cycle.
When thyroid hormone levels are too low, it can influence ovulation and the way the uterine lining builds and sheds. For some women, that can show up as heavier or more prolonged bleeding.
If this is a new pattern, especially alongside symptoms like fatigue, feeling cold, constipation, dry skin, or hair changes, it may be worth looking beyond reproductive hormones alone.
Changes in your period can sometimes be one of the first clues that another system needs attention.
If your cycle has changed and you are not sure why, book a consultation with our team so we can look at your symptoms, history, and relevant labs together.