The Chemicals Changing Your Body

The Chemicals Changing Your Body

Date: 22 May 2026Posted By: MOH Kenya Ages 10–14

Have you ever felt like your emotions have a mind of their own? One minute you're fine. The next minute you're angry, sad, or laughing for no clear reason.

Or maybe you've noticed changes in your body - hair in new places, a deeper voice, or your face changing. And everyone keeps saying, "It's just hormones."

But what are hormones and why are they suddenly keen to take over your life?

What Are Hormones?

Hormones are chemical messengers. Your brain sends them through your blood to different parts of your body to say: "Grow now.", "Change here." "Get ready." During adolescence, your body releases hormones that trigger physical growth, sexual maturation and emotional changes.

Think of hormones like text messages from your brain. Some say "start your period" or "deepen your voice." Others say "feel more intense right now" or "notice that person differently."

Let's go straight to Hormone Headquarters - your brain - and meet the chemicals that are quietly shaping who you're becoming.

Meet Your Main Hormones

  • Estrogen

This hormone plays a key role in developing breasts, regulating the menstrual cycle, and influencing mood. While it is more active in females, males also have small amounts.

  • Testosterone

This hormone is responsible for deepening the voice, increasing muscle mass, and promoting facial and body hair growth. While it is more active in males, females also have small amounts.

  • Cortisol

Known as your "alert" system, Cortisol manages your body's stress response. It is active in everyone.

  • Dopamine & Serotonin

These hormones are central to regulating your mood, feelings of pleasure, happiness, and focus. They are active in everyone.

Just a heads up every single person goes through this. You are not broken. You are not weird. Your body is simply learning new ways to grow.

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