The Root chakra is about being physically there and feeling at home in situations. If you tend to be fearful or nervous, your Root chakra is probably under-active. You easily feel unwelcome.
The Sacral chakra is about feeling and sexuality. If you tend to be stiff and unemotional or have a “poker face,” the Sacral chakra is under-active. You’re not very open to people.
The Navel chakra is about asserting yourself in a group. When it is open, you feel in control and you have sufficient self esteem.
The Heart chakra is about love, kindness and affection. When your Heart chakra is under-active, you are cold and distant.
The Throat chakra is about self-expression and talking. When it is open, you have no problems expressing yourself, and you might be doing so as an artist.
The Third Eye chakra is about insight and visualization. If this chakra is over-active, you may live in a world of fantasy too much. In excessive cases halucinations are possible.
The Crown chakra is about wisdom and being one with the world. If this chakra is over-active, you are probably intellectualizing things too much. You may be addicted to spirituality and are probably ignoring your bodily needs.