Signs a Teen May Be Getting Their First Period

A teen’s first period, also called menarche, is a major developmental milestone. For many families, it can feel equal parts exciting, confusing, and emotional. Knowing the common signs that a first period may be approaching can help teens feel prepared and supported, rather than surprised or anxious.

Below are the most common, research‑backed signs that a teen may be getting their first period, along with guidance on what’s normal and when to talk to a healthcare provider.

1. Breast Development Has Begun

One of the earliest signs of puberty is breast development, which typically begins 2–3 years before the first period. Breasts may feel tender, sore, or uneven at first—this is completely normal.

If breast buds have been developing for a while, it’s often a signal that menarche is getting closer.

2. Growth Spurts Slow Down

Many teens experience a rapid growth spurt early in puberty. Once growth starts to slow, it can indicate that the body is shifting toward later stages of development—including the onset of menstruation.

Most people grow only a few additional inches after their first period.

3. White or Clear Vaginal Discharge Appears

A clear or milky‑white vaginal discharge is one of the strongest indicators that a first period may be coming soon—often within 6 to 12 months.

This discharge is caused by rising estrogen levels and is a normal way the body keeps the vagina healthy. It should not have a strong odor or cause itching.

4. Body Hair Becomes More Noticeable

The appearance of hair under the arms and around the pubic area often occurs before menstruation begins. Hair may start out fine and light before becoming darker or thicker over time.

5. Acne and Oily Skin Increase

Hormonal changes during puberty can increase oil production in the skin, leading to acne—especially on the face, chest, and back.

While acne alone doesn’t mean a period is imminent, combined with other signs, it may point to shifting hormone levels.

6. Mood Changes and Stronger Emotions

Fluctuating hormones can affect mood, even before periods officially begin. Teens may experience:

Increased irritability
Emotional sensitivity
Sudden sadness or frustration

These changes are common and not a sign that something is “wrong.” Emotional shifts are a normal part of puberty.

7. Cramps or Lower Abdominal Discomfort

Some teens report mild cramping, bloating, or pressure in the lower abdomen in the weeks or months leading up to their first period. These sensations are typically mild and short‑lived at first.

8. Age Range Falls Within the Typical Window

Most teens get their first period between ages 9 and 15, with the average age in the U.S. around 12 to 13 years old. Starting earlier or later can still be normal, but it’s worth checking in with a healthcare provider if puberty hasn’t started by age 13 or a period hasn’t occurred by age 15

How to Help a Teen Feel Prepared

If signs point to an upcoming first period, preparation can make a big difference. This means taking to her opening about what she can expect, keeping period underwear or pads available. It's also important to understand that there will be a change in her emotions and you should make her feel that this is normal.

Feeling informed helps teens feel empowered rather than embarrassed. Reassure them that everyone’s timeline is different

When to Talk to a Doctor

Consider reaching out to a pediatrician or healthcare provider if:

Puberty signs are very early (before age 8)
There are no signs of puberty by age 13
Discharge has a strong odor, itching, or discoloration

There’s no single sign that guarantees a first period is about to start but when several of these changes appear together, it’s often a sign the body is getting ready.