---
title: "Hormones and your body: thyroid, prolactin and more"
description: "How thyroid conditions, high prolactin, premature ovarian insufficiency, low energy intake and weight can affect periods, and what hormone tests can show."
url: "https://myruva.co/learn/topics/hormones"
language: "en-GB"
---

# Hormones and your body: thyroid, prolactin and more

How hormones beyond the cycle itself can change your periods, and what blood tests can and can’t tell you.

- [High prolactin (hyperprolactinaemia)](https://myruva.co/learn/high-prolactin-hyperprolactinaemia): What high prolactin can mean for your periods, why medicines matter, and which headache or eyesight changes need urgent help.
- [Hormone blood tests: what they can and cannot tell you](https://myruva.co/learn/hormone-blood-tests-explained): What common hormone tests look for, why timing matters, and why an AMH result can’t forecast your future fertility. Includes when to get help.
- [Premature ovarian insufficiency (POI)](https://myruva.co/learn/premature-ovarian-insufficiency): POI before 40: symptoms, tests, hormone treatment, bone and heart health, fertility options and emotional support. Includes when to get help.
- [Thyroid conditions and your cycle](https://myruva.co/learn/thyroid-and-your-cycle): How thyroid conditions can affect periods, fertility and pregnancy, and why symptoms after giving birth are worth checking.
- [Weight, eating and your cycle](https://myruva.co/learn/weight-eating-and-your-cycle): How food and weight changes can affect periods, why eating problems deserve care at any size, and where to find support.
- [When training affects your periods: RED-S](https://myruva.co/learn/red-s-low-energy-availability-and-periods): How not eating enough for your training can affect periods, bones and performance, and how to get support with food and rest.
- [Can stress delay your period? Sleep and exercise](https://myruva.co/learn/stress-sleep-exercise-and-your-cycle): What the evidence says about how stress, sleep and exercise affect your cycle, what low energy availability means, and when to get a missed period checked.