Dopamine is a messenger substance—also known as a neurotransmitter—in your brain. Imagine the brain as a massive network where trillions of pieces of information are exchanged. Dopamine acts as a crucial signal within this system, essentially saying: "Pay attention, this is important and could benefit you!"

It works primarily within the so-called reward networks. When you do something worthwhile—such as achieving a goal, learning something new, or eating something delicious—dopamine signaling increases. The result is the motivation needed to repeat that action.

Myth: "Dopamine is pure happiness."

• Fact: Dopamine is more about drive and the feeling of "This is worth it, keep going."

Myth: "Happiness is created here!"

• Fact: True joy, contentment, and serenity come from many factors: serotonin, good social relationships, sleep, and achieving meaningful goals.

Myth: "Dopamine is only about reward."

• Fact: Dopamine also helps the brain learn from negative experiences ("I will avoid that in the future"). It serves as a learning and orientation aid.

When you are healthy and have a goal ahead of you—such as exercising or writing an email—dopamine signaling increases. This helps you muster the necessary energy and concentration.

In the case of depression, these signals can be dampened. This leads to:

• Lack of Drive: The signals meant to get you started are too weak. Tasks feel pointless or immensely difficult.
• Loss of Joy: Things that used to be fun no longer provide a "kick." Your reward system no longer responds sufficiently.

Research shows that motivating stimuli can activate the dopamine system. This is why small, manageable achievements are so important: they give the dampened system a gentle boost.

Treating depression is complex; addressing dopamine alone is not enough. It requires an interplay with serotonin (mood, sleep, serenity) and norepinephrine (wakefulness, alertness). For this reason, treatment with psychotherapy and antidepressants usually targets the entire network—for example, by activating behavior, utilizing light, and stabilizing sleep.

Treatment is also possible with a Digital Health Application (DiGA) like deprexis. It is based on the principles of Cognitive Behavioral Therapy (CBT), which is particularly effective for depression, and provides support through helpful information, insights, and exercises. deprexis is medically approved and can be prescribed by your family doctor, with health insurance covering the costs. The online coaching program can be used at any time and in any place.

• Emergency Services: 112 (free of charge, valid EU-wide)
• Crisis Helpline (Telefonseelsorge): 0800 1110111 / 0800 1110222 (anonymous, around the clock, free of charge)
• Immediate Medical Aid: Call your psychiatric or family doctor's practice, or go to the nearest psychiatric clinic.

There is no reliable at-home dopamine test. While a saliva or blood test can measure dopamine or its breakdown products, it says almost nothing about dopamine activity in the brain. The symptoms of a dopamine deficiency overlap far too much with other potential causes, such as a thyroid dysfunction or a vitamin deficiency. Therefore, do not rely on online self-tests if you have symptoms; instead, seek a professional evaluation. If you still need some guidance—for example, to discuss a possible dopamine deficiency with your doctor—the lists below can help.

• Lack of drive: Starting things is very difficult, even simple tasks (lethargy).
• Lack of joy: Everyday activities provide less of a "kick," even though they used to be fun.
• Procrastination: Tasks are not started or are abandoned quickly.
• Difficulty learning: New information does not stick as well, and concentration declines.
• Increased rumination: Thoughts spin in circles, and taking steps toward action feels difficult.
• Social withdrawal: Interest in social contact fades because it doesn't feel "worth it."