When asking "what is a cycle," one is often looking for a practical explanation of how a process repeats in fixed patterns. In biology, the word cycle is used for processes that start, develop in phases, and return to a starting point. The most common example in everyday life is the menstrual cycle, but the term can also be used for other repeated processes in the body.

In this guide, you will gain a concrete understanding of the cycle, how the menstrual cycle is typically structured, and how you can track your own patterns in a safe and simple way.

The menstrual cycle is the body's recurring preparation for a possible pregnancy. The cycle is usually counted from the first day of bleeding (day 1) to the day before the next bleeding starts.

It is important to know that there can be significant normal variation. Some have very stable patterns, while others experience fluctuations from month to month, without it necessarily meaning that something is wrong.

The menstrual cycle is often described in four phases. The length of the phases can vary from person to person.

Here, the uterine lining is shed if pregnancy has not occurred. For many, bleeding typically lasts for a few days.

The body matures an egg in the ovary, and the uterine lining begins to rebuild. This phase is often the one that varies most in length.

During ovulation, a mature egg is released. It is during this period that the chance of pregnancy is typically highest. Some feel ovulation as a slight pain on one side, others feel nothing.

After ovulation, hormones affect the body so that the uterine lining can be maintained. If pregnancy does not occur, hormone levels gradually drop, and a new menstruation begins.

Cycle length tells you how many days pass from the first day of one menstruation to the first day of the next menstruation. Ovulation does not necessarily occur on the same "calendar day" each month.

A practical rule of thumb in understanding the cycle is that variation is often due to the time leading up to ovulation, while the time after ovulation is often more stable for many. However, it is individual, and therefore it makes the most sense to observe your own pattern over several cycles rather than comparing yourself to others.

Several factors can affect the cycle without being inherently dangerous. These can include changes in life situation, illness, or changes in contraception. Some also experience changes after pregnancy and during breastfeeding.

You might consider seeking advice if you experience, for example:

• very heavy bleeding or bleeding between periods
• severe pain that affects your daily life
• newly occurring significant irregularity
• concerns about pregnancy, fertility, or general cycle and health

If you are in doubt, it is perfectly legitimate to have a conversation with your doctor. It's not about overreacting, but about gaining peace of mind and relevant help.

Tracking your cycle can make it easier to understand patterns and detect changes. You can do this with an app or a simple notepad.

• date of the first day of bleeding
• duration of bleeding
• pain, mood, and energy level (if you wish)
• changes in discharge (some use it as a sign of where they are in their cycle)

The purpose is not to control the body, but to gain a useful overview that you can use in everyday life or bring to a healthcare professional consultation.

If your cycle knowledge is related to pregnancy or breastfeeding, comfort and support in everyday life can also play a role. Many prefer a solution without underwires during this period. An example is the Gel-Support® Maternity & Nursing Bra which uses gel support as a flexible alternative and is designed to adapt to body changes from pregnancy to breastfeeding.