Period questions are often more specific than “Are my hormones balanced?” You might want to understand the timing of a cycle, describe bleeding that has changed, or learn the difference between a cycle phase and a symptom pattern. This hub gives those questions a shared starting point.
Begin with the menstrual-cycle guide if you want the sequence explained. The estrogen and progesterone comparison introduces two names you may encounter along the way. Birth-control information offers a separate route when the question is about a method rather than a natural-cycle diagram. You do not need to read every guide before following the one most relevant to you.
For context around early periods, use Teens & First Periods; for a question about PCOS, use the condition hub. The aim is to help you describe what you want to understand without turning a calendar or symptom list into a diagnosis.
Available guides
- Your Menstrual Cycle: Hormones, Phases, and What’s Normal
- Estrogen vs. Progesterone: How They Work Together
- Hormonal Birth Control: The Pill, IUD, Patch, and More
- Irregular Periods and Hormones: Understanding Your Cycle
- PMS vs. PMDD: How to Tell the Difference and Get Help
- Period Pain Getting Worse With Age? Causes and What Helps
- The Luteal Phase: What Progesterone Does After Ovulation
- Cervical Mucus and Your Cycle: What the Changes Mean
- Period Cravings and Hunger: Why They Happen and What Helps
Explore related topics
Explore the cycle
One cycle, connected phases
Choose a phase to read a short explanation. A period is part of the follicular phase, rather than a separate step before it.
Your period
The uterine lining is shed as a period. The first day of bleeding is also the start of the follicular phase.
Follicular phase
This phase starts with your period and continues until ovulation. Follicles develop in the ovary, and estrogen helps the uterine lining grow. The length can vary.
Ovulation
An ovary releases an egg. Timing varies between people and between cycles; this illustration does not identify when you ovulate.
Luteal phase
After ovulation, the remaining follicle forms the corpus luteum and produces progesterone. If pregnancy does not occur, hormone levels fall and another period begins.
A general reading guide, not a personal cycle prediction or fertility tool. Cycles vary, and hormonal contraception can change bleeding and ovulation.
Sources: Office on Women’s Health and NHS.
Period Cravings and Hunger: Why They Happen and What Helps
It's the day before your period. Your lower belly aches, you're tired, and suddenly you…
Cervical Mucus and Your Cycle: What the Changes Mean
You notice it in your underwear or when you wipe: some days it's barely there,…
The Luteal Phase: What Progesterone Does After Ovulation
Perhaps a few days after the middle of your cycle, you notice a shift. Your…
Period Pain Getting Worse With Age? Causes and What Helps
Maybe in your twenties, a hot water bottle and a quiet evening did the trick.…
PMS vs. PMDD: How to Tell the Difference and Get Help
For three weeks of the month, you feel like yourself. Then, about a week before…
Irregular Periods and Hormones: Understanding Your Cycle
Your period used to show up like clockwork. Now it's 24 days one month, 40…
FSH Explained: Understanding Your Hormone Test Result
Maybe your doctor checked your FSH because your periods have changed. Or you're trying to…
Estrogen vs. Progesterone: How They Work Together
You've probably heard estrogen and progesterone mentioned in the same breath, often alongside words like…
Hormonal Birth Control: The Pill, IUD, Patch, and More
Choosing birth control can feel like a lot. Your friend loves her IUD, your sister…
Your Menstrual Cycle: Hormones, Phases, and What’s Normal
Most of us learned about the menstrual cycle from a neat diagram in health class:…